Helpful video, thanks. This helped me with figuring out the calculation of slope for aircraft descent rates. Pretty cool how this stuff works sometimes!
Another way to state it once you get round the mathy stuff! is that there are 2 x pi or 6.28.. radius lengths in one circle and one radius length around the circumfrence is 360 degrees divided by (6.28).....( or 2 x pi) = 57.2958 degrees per circumfrential radius length which is a radian!
if your in to cars and engines ect the radian is used to determine the number of metres per unit force a turn (torque) and multiplied by the number of turns / time to give watts or horse power!
Hi there Sal great video as usual, I don't know if you were just pretending not to remember how to convert to radians for the sake of the video ;) but just in case the way I remember it is that radians usually look like A pi/ B so to convert to radians you multiply by pi (on top) then divide by 180. To get degrees its just the opposite of that.
i saw a REALLY neat trick while he was doing this when he was giveing out the problems like 45 or 2 or 30 your answer for the problem is how many times it goes in to the number of degrees the circle in questions is!
Iunno, when I use the exact value 57.29577951 on my calculator, it gives a dead-on accurate result everytime.
Apparently this value, is somewhat an ideal standard for degrees that don't exceed 10,080,000 degrees, and radian values that don't exceed 175930 (estimate).
This comment has received too many negative votesshow
Oh shit my bitch got home. Bro's, we're gonna have to hold back on this math shit, my bitch is gonna come down and ahh who cares well do another damned problem.
@Unit047 don't call your girlfriend or wife a bitch. that's not very respectful and makes you look like a douchebag instead of a cool guy. If she got home, im guessing she makes the money and you sit at home like a fatass
@darkness902 Radians and Radii are two different things. In a circle with radius r and center at the origin, a Radian is the measure of an angle in standard position whose terminal side intercepts an arc length of r. A Radius is the distance from the center of the circle to a point on the circle. So the plural form of radian is radians and the plural form of radius is radii. Hope this cleared things up!
@MidnightRedemption Because Pi is, in a way, flawed. If you used Tau, which is equalivilant to 2Pi, it would make a LOT of Trig a LOT easier. But not many people know about Tau, and therefore Pi has stayed. Look it up, Pi vs Tau, it's really quite interesting.
@tigerstar216 You sir, will go far in life if your desire to learn new things is so great you enjoy learning about math. No sarcasm intended, I just don't have that same drive. Good Luck.
@HappyTissues Thank you very much. Math is actually my favorite subject. I hope to have a math-oriented career. Kepp trying in math and eventually you will get it.
you have got to be like the best math teacher in the world. All your videos could just be watched once to be able to get what you are explaining. But i find myself watching it more than once so i could it understand it as good as you. I dnt think nyone watching your videos could thank you enough. Also im wondering why teachers in general dnt explain it as well as you do. Thanks.
This comment has received too many negative votesshow
ok first of all you do shit that someone wanting to learn wouldnt understand 2nd half the shit you say does not add up its wrong WRONG this is why u arnt teaching in a class and only on youtube u answers you give to your own questions need to be put down in simple format u no what that is right like 3.7 the hypotenuse times the degree angle 53 or some shit like that to figure out the other sides alright you even confuse yourself
@CryptDoidge wow don't hate because nobody asks you for help or you don't get any attention. -_-" This is an alternative way for kids to get help for school.
I wish youtube could be there years ago when we had our learning years. You are doing a noble job and you are truelly gifted and made for this respected profession. How do you generate a revenue for yourself?
lol.. "oh, er my wife just got home, so i'm just gonna have to leave the presentation like that, and i will continue it er, later, i think you might get the point - actually let me just finish this problem, and then i'll go attend to my wife" lol.. the perfect nerd, i love it, sal, you're gonna get me through my senior years!
This really is helpful. When u explain it, it all seems simple + ur voice makes it sounds simple for some reason, but when my teacher speaks her voice is just soo annoying that i cant even focus. GJ, keep em comming.
Why not in the last problem, instead of multiplying (pi/2)(180/pi), just substitute pi by 180. I tested this "theorem" and if you have , for example 13pi/5 = ?, just multiply 13 (180) and then divide by 5: 180(13) = 2340 divided by 5 = 468 therefore (13pi/5) = 468 deg . now we check: 468pi/180 (/4) = 117pi/45 (/9) = 13pi/5. What do you think?
@jaidrofire "Why not in the last problem, instead of multiplying (pi/2)(180/pi), just substitute pi by 180. " You can substitute "pi rad" by "180 deg", since we said that pi rad=180 deg. That's great and I think the teacher won't say that you are wrong if you do that, but the problem comes when there is NO pi in the equation. For example, you are asked to change 2 rad into degrees, and your "trick" won't work. Other than that situation, your "trick" is fine.
@dalcde In that case to change from 2 rad into deg is another formula (yeah that trick won work here). x rad = x (180/pi). in this case: 2 rad = 2 (180/pi) = 114.6 (estimated)
omg my maths teacher tried to explain this to me but i didnt get it at all and was really worried as everyone else seemed to get it but now i think i no what i have to do thankyou x :)
man i was in the hospital for 1 whole week so i missed school. Now, im falling behind in my precalculus class, after watching this video, i feel like i alrdy catch up with the class! thank you Mr. Khan! thank you!
This made me learn Trig so quickly, you're so awesome. (y) I need to cram a year's worth of Math in my head in less than 10 days to pass the AP Math exam.. Wish me luck. T_T
Radians are used because it is both a unit of angle and of distance. This matters when you start to graph because you use it for both the angles and the X & Y coordinates on a graph.
I've been trying to dust off my old calculus skills and discovered that my trig skills were all corroded, too. I want to thank you so much for the lesson!
Im starting to believe u are my hero! im takin chem 1 and trig this semester in college, and am having a hard time.. and you are saving me in both subjects. i love ur humbleness in teaching- you accually act like a human, not a stuck up know it all teacher! thanks khan,, ur da best of da rest!
It's amazing how you can be a math expert and still forgets the formulas except the basic ones. You gave me hope because I am also like that I usually remember the basic formula and forget rest and have to rewrite the basic formula everytime to reach other formulas. So I always thought to be math expert you need to remember everything but you proved otherwise. Thanks a lot. I love watching your videos.
you don't need to make any changes but you should have the wife watch this particular video, I'm sure she would think it's cute how you almost went into a panic in your eforts to "tend" to her!!as usual, your videos are clearly superior to any others of their kind!!
i prolly should have went to class this week... bad time to skip every lesson on trig and try and pick it all up in less than 5 hours... so far im kickin trigs ass because of your vids
Your wife just came back!!!!! Seriously dude, you should inform her that she has just interrupted a very informative and valuable moment of my life. Thanks anyway.
Ecc 12:11-14 The words of the wise are as goads, and as nails fastened by the masters of assemblies, which are given from one shepherd. And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man. For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
oh, well then I am smarter than I gave myself credit for. I can always find the long decimal answer for any radian. I just thought every answer had to be given in terms of a pi equation and it just seemed like that would be really a big pain in the butt for random angles. I went from learning the degrees/minutes/seconds back to radians where I was barely able to express 45deg. lol I guess I just overreacted out of frustration. Thanks!
So... every example I find is always with the simple angles like 90, 45, 30 etc... what happens for like 33 deg or some odd random angle that requires pi's denominator to be a decimal??? Maybe I'm just dense, but I am having a lot of trouble figuring this whole radian measure thing out. I can calculate answers to the more odd angles, but then I will get a long decimal sometimes and I get all confused. Any advice?
Helpful video, thanks. This helped me with figuring out the calculation of slope for aircraft descent rates. Pretty cool how this stuff works sometimes!
MileHigh537 1 week ago
@MileHigh537 Sure is i love mathamatics :)))))
LittleFella222 2 days ago
i wondered who is this genious human's wife...hint?
themin91 3 weeks ago
Why did I not have this lesson at school? answer: Cirriculums Useless N Teacher Sucks. What a waste of money school was!
Let's hope the great Sal Kahn or can model gets into more schools!
and the CUNT model fucks right the hell off!
with the shit teachers!
bigtopbollocks 1 month ago
Another way to state it once you get round the mathy stuff! is that there are 2 x pi or 6.28.. radius lengths in one circle and one radius length around the circumfrence is 360 degrees divided by (6.28).....( or 2 x pi) = 57.2958 degrees per circumfrential radius length which is a radian!
if your in to cars and engines ect the radian is used to determine the number of metres per unit force a turn (torque) and multiplied by the number of turns / time to give watts or horse power!
bigtopbollocks 1 month ago
Wow, thanks so much, it makes much more sense to me now! :)
AbsolumentFabuleuse 1 month ago
Stupid question but what does sub-tan mean?
Swh3913 1 month ago
@Swh3913 No Wait never mind heard him wrong
Swh3913 1 month ago
Hi there Sal great video as usual, I don't know if you were just pretending not to remember how to convert to radians for the sake of the video ;) but just in case the way I remember it is that radians usually look like A pi/ B so to convert to radians you multiply by pi (on top) then divide by 180. To get degrees its just the opposite of that.
BTW the plural of radius is indeed 'radii'.
coresnake0 1 month ago
i saw a REALLY neat trick while he was doing this when he was giveing out the problems like 45 or 2 or 30 your answer for the problem is how many times it goes in to the number of degrees the circle in questions is!
mattrocde 1 month ago
Lol. Radius's
musicmelodyx 2 months ago
@musicmelodyx Radius'
99Ownsz99 2 months ago
More thank THANK YOU MRS.
jaliyad 2 months ago
Light bulbs just went on. Things make way more sense once I understood what a radian was... Wow but that makes it a lot easier to understand!
reticentdragon 2 months ago
YOU ARE HILARIOUS !!! XD
nervanalovelynano 3 months ago
my wife came home so i have to stop teaching u via video that i can edit? really...
CjCrusher415 3 months ago
THIS IS GOLD. I GET IT NOW. THANK YOU :D
wasteofspace1234 3 months ago
Thank you do so much, you explain everything so well and you have such a pleasant voice :)
kingdfb0 3 months ago
its radii btw.
usrnameaz09original 3 months ago in playlist Trigonometry
He managed to teach me in less than 10 minutes what my Geometry teacher couldn't in one hour...
isanny101 3 months ago 6
what program do you use for this?
Booth272 4 months ago
Iunno, when I use the exact value 57.29577951 on my calculator, it gives a dead-on accurate result everytime.
Apparently this value, is somewhat an ideal standard for degrees that don't exceed 10,080,000 degrees, and radian values that don't exceed 175930 (estimate).
It's surprisingly accurate.
COZYTW 5 months ago
Could you please redo this I am not getting it at all.
ace1122tw 6 months ago
This comment has received too many negative votes show
Oh shit my bitch got home. Bro's, we're gonna have to hold back on this math shit, my bitch is gonna come down and ahh who cares well do another damned problem.
Bitch is making me a sandwich anyways.
Unit047 6 months ago
@Unit047 don't call your girlfriend or wife a bitch. that's not very respectful and makes you look like a douchebag instead of a cool guy. If she got home, im guessing she makes the money and you sit at home like a fatass
btrballin 6 months ago 44
@btrballin
Dude! He's just restating what Kahn said in douchespeak. LOL
Thornshadow17432 5 months ago
@Thornshadow17432
o_O
Or is he serious...o_O
Thornshadow17432 5 months ago
@btrballin How much do you think she charges per night?
SuperSlayerX 2 months ago
@btrballin why mention it in the video at all?
skjimon 2 months ago in playlist Trigonometry
do geometry first kiddies. ha ha
elizabethkenny100 7 months ago
Teach the kiddies about steradians later on.
ouriyou 7 months ago
i still don't get it....
iwuvcarpets 7 months ago
awwww. you have a very lucky wife.
anonymous5034 7 months ago 5
THANKS SO MUCH!
Roger4313 7 months ago
This is great! no more going to sleep confused and pissed off! :D
KBClublife 7 months ago 2
I can't listen to this one sorry sounds like you are eating something.
mdeioma 7 months ago
can you upload this in 720p? Thanks Sal.
shoutty9 7 months ago
LOL, he needs to go attend to his wife. <333 what a good man.
WHHB1223 7 months ago 82
@WHHB1223
lmao that was funny.
guanatail 4 months ago
i can finally have help
Fighterftwful 8 months ago
Well he just has the gift explaining math in minutes, but has he discovered anything new? no offense Salman Sorry.
spyrolatro 8 months ago
@spyrolatro oh yes he did,u will be dead oneday lol lol
drzakir123 7 months ago
"subties an arc of two pie radiasisis or radyi" - haha... to funny.
paulalkemadesigns 8 months ago
Pacman. FTW.
icuicuicuicuicu 9 months ago
This has been flagged as spam show
its radii my friend
darkness902 9 months ago
its radii my friend
darkness902 9 months ago
@darkness902 Radians and Radii are two different things. In a circle with radius r and center at the origin, a Radian is the measure of an angle in standard position whose terminal side intercepts an arc length of r. A Radius is the distance from the center of the circle to a point on the circle. So the plural form of radian is radians and the plural form of radius is radii. Hope this cleared things up!
9bluelagoon9 9 months ago
@darkness902 WHOOPS I thought you meant radians should've been radii, but I realized you were referring to something else! Sorry!
9bluelagoon9 9 months ago
....your circles were better before XD
narcomanel 10 months ago
When I finally understood the concept of 1 radian on a unit circle, I said to myself "whoa, this is just too good for words!"
euch27 10 months ago
wait.. isn't pi is 360 degree?
i mean pi = full circumference = 360 degree.
why 2pi rad = 360?
MidnightRedemption 10 months ago
@MidnightRedemption Because Pi is, in a way, flawed. If you used Tau, which is equalivilant to 2Pi, it would make a LOT of Trig a LOT easier. But not many people know about Tau, and therefore Pi has stayed. Look it up, Pi vs Tau, it's really quite interesting.
adamanddustinh 10 months ago
This has been flagged as spam show
Is 180deg/pi acceptable as well, or is it a completely different angle than (180/pi)deg ?
krogan92 10 months ago
Comment removed
krogan92 10 months ago
Is it wierd that im a sophomore in highschool that is learning this?
HappyTissues 11 months ago
@HappyTissues Same here, not weird.
bennyboy6761 11 months ago
@HappyTissues I'm learning this for fun in seventh grade.
tigerstar216 10 months ago 2
@tigerstar216 You sir, will go far in life if your desire to learn new things is so great you enjoy learning about math. No sarcasm intended, I just don't have that same drive. Good Luck.
HappyTissues 10 months ago
@HappyTissues Thank you very much. Math is actually my favorite subject. I hope to have a math-oriented career. Kepp trying in math and eventually you will get it.
tigerstar216 10 months ago
@tigerstar216 I wish this stuff was available in 7th grade. Now I'm watching Khan for university!
tehmadcap 7 months ago 3
This has been flagged as spam show
Time to stop crying try Naughty women benaughtyman.info
laksikakanchana 11 months ago
are you married to Mrs. Fenker?
904person 11 months ago
you have got to be like the best math teacher in the world. All your videos could just be watched once to be able to get what you are explaining. But i find myself watching it more than once so i could it understand it as good as you. I dnt think nyone watching your videos could thank you enough. Also im wondering why teachers in general dnt explain it as well as you do. Thanks.
glitchVer1 11 months ago 3
thanku very muchhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
mvkotekar 11 months ago
This has been flagged as spam show
I wish to thank you so much in your help in this matte busizz4me.info
geratmathew 11 months ago
emm my log table say that 90* is pi over 2?????
coolwHip200 1 year ago
@coolwHip200 because 180* = pi rad, so if you divide both sides by 2, 90* = pi/2 rad
iMaMyst3ry 10 months ago
Sal take care of your wife first!..she is going to scold you!
MsAllahhuakhbar 1 year ago
How do you spell the word at 1:24 ? Sub -
ChristineChern 1 year ago
"Let me just finish this problem, then I can go attend to my wife"
*a minute and a half later*
"Let me just do one more"
hedonism13 1 year ago
This video just singlehandedly helped me with my homework.
Artoofeva 1 year ago
You're better at teaching than my current math teacher. thank you.
CompulsiveColorer 1 year ago
in the begining you explained the definition of subtense with the word subtense... made me rewind twice lol
sixxdegree 1 year ago
That would be radii! :)
Denseworldproduction 1 year ago
great tutorial, question: can I use inverse sign to convert rads into degrees?
ikesideas 1 year ago
This helps but not enough! Explain complementary and supplementary!
Trogdora 1 year ago
Khaaan!, are you on the computer again? Sometimes I fell like you just don't care about me!
foreverseethe 1 year ago
Awesome job! After two periods of math I still couldn't understand it, yet you explain it way better than my teacher in ten minutes =)
wafflecraft 1 year ago
THANKYOU my teacher never explained this
dizzycritic 1 year ago
Its like a teacher that I can rewind... Its soo awesome
kingjames111893 1 year ago
Finally, i finally complete this milestone once for all. Thanks for explaining it. I spend hours in tutoring none of them ever said any of this.
answerOfstupids 1 year ago
Hahaha your such a silly man! :)
Izzy2daSHEzzy 1 year ago
radiuseses!! Haha awesome video.
YashisGreatest 1 year ago
very nice
ravikanthroyss 1 year ago
u are the best.
....the best, the best, the best
Abdallah0822 1 year ago
This comment has received too many negative votes show
ok first of all you do shit that someone wanting to learn wouldnt understand 2nd half the shit you say does not add up its wrong WRONG this is why u arnt teaching in a class and only on youtube u answers you give to your own questions need to be put down in simple format u no what that is right like 3.7 the hypotenuse times the degree angle 53 or some shit like that to figure out the other sides alright you even confuse yourself
CryptDoidge 1 year ago
@CryptDoidge
You confuse me. What are you saying? All of this that he just said is completely correct. Sal is a genius, and is not teaching in a classroom because
A) This is an alternative
B) He reaches more people this way
C) He has no formal teaching degree (yet ironically teaches better than most teachers I had).
Lrn to Lrn. And type.
hedonism13 1 year ago 4
@CryptDoidge manners...
aXpersonXyoudXforget 1 year ago
@CryptDoidge troll alert
Mal1234567 1 year ago
Comment removed
Nabiili 1 year ago
@CryptDoidge wow don't hate because nobody asks you for help or you don't get any attention. -_-" This is an alternative way for kids to get help for school.
Nabiili 1 year ago
hmm
Owner of Khan Acadmey is Muslim and He is serving Humanity Good job bro
Keep it up
Jawwad16 1 year ago
@Jawwad16
Muslim? Where'd you get that from?
hedonism13 1 year ago
@hedonism13 his name is khan DUH
Rgvfan12 8 months ago
I wish youtube could be there years ago when we had our learning years. You are doing a noble job and you are truelly gifted and made for this respected profession. How do you generate a revenue for yourself?
God Bless.
TheLoveispure 1 year ago 54
@TheLoveispure His website is completely nonprofit, but he takes a salary.
JakesReality 6 months ago
lol.. "oh, er my wife just got home, so i'm just gonna have to leave the presentation like that, and i will continue it er, later, i think you might get the point - actually let me just finish this problem, and then i'll go attend to my wife" lol.. the perfect nerd, i love it, sal, you're gonna get me through my senior years!
IAMDYLAN17 1 year ago
Lol Nice... Haha WIfe getting home... YOu dont seem old though.. are you like what 20?
fleeb747 1 year ago
Sal, you are the man!!
xraycat28 1 year ago
Yeah khan, you just have this enchanting voice that makes math easy. No joke. :)
HearTheBlue 1 year ago
This really is helpful. When u explain it, it all seems simple + ur voice makes it sounds simple for some reason, but when my teacher speaks her voice is just soo annoying that i cant even focus. GJ, keep em comming.
nanotech2080 1 year ago
Why not in the last problem, instead of multiplying (pi/2)(180/pi), just substitute pi by 180. I tested this "theorem" and if you have , for example 13pi/5 = ?, just multiply 13 (180) and then divide by 5: 180(13) = 2340 divided by 5 = 468 therefore (13pi/5) = 468 deg . now we check: 468pi/180 (/4) = 117pi/45 (/9) = 13pi/5. What do you think?
jaidrofire 1 year ago
@jaidrofire "Why not in the last problem, instead of multiplying (pi/2)(180/pi), just substitute pi by 180. " You can substitute "pi rad" by "180 deg", since we said that pi rad=180 deg. That's great and I think the teacher won't say that you are wrong if you do that, but the problem comes when there is NO pi in the equation. For example, you are asked to change 2 rad into degrees, and your "trick" won't work. Other than that situation, your "trick" is fine.
dalcde 1 year ago
@dalcde In that case to change from 2 rad into deg is another formula (yeah that trick won work here). x rad = x (180/pi). in this case: 2 rad = 2 (180/pi) = 114.6 (estimated)
jaidrofire 1 year ago
This has been flagged as spam show
much appreciated
alanpullela 1 year ago
This has been flagged as spam show
much appreciated
alanpullela 1 year ago
This has been flagged as spam show
much appreciated
alanpullela 1 year ago
Comment removed
alanpullela 1 year ago
I finally get this!!! Now excuse me I'll be watching the rest of ur vids on trig^^
diane947 1 year ago
i prefer watch all of your videos than read my books...
aceyabank 1 year ago 3
@aceyabank SAME HERE!!!
cutieolest 1 year ago
That bit about the wife getting home was hilarious!! LOL
TheSkepticalAtheist 1 year ago 5
Thanks man this video helped me out a ton!
Awlaad1 1 year ago
lol you chose math over your wife
andresblazeit420 1 year ago
Dude, this video really helps me, I got really comfused with this stuff. Rock on man.
tochbomb1 1 year ago
hehe its "ray-dye" i think...
theartoffugue 1 year ago
i be lovin' yo 1337 ghetto drawing skillz ma man. Peace and love to yo and yo wife~
GUNNYinc 1 year ago 3
OMWife jus came how so lemme jus finish dis and urm...TEND to my wife LMAO =D
limhongyao 1 year ago
omg my maths teacher tried to explain this to me but i didnt get it at all and was really worried as everyone else seemed to get it but now i think i no what i have to do thankyou x :)
00Pinkbabe00 1 year ago
man i was in the hospital for 1 whole week so i missed school. Now, im falling behind in my precalculus class, after watching this video, i feel like i alrdy catch up with the class! thank you Mr. Khan! thank you!
vibol03 1 year ago
this guys narration is funny lolz
this was a big help
1Jivan642 1 year ago 3
It makes so much more sense to me now! Thank you for making these awesome videos!
abthebluepup 1 year ago
OMG, I love you! That helped so much! = )
noel51191 2 years ago
Thank you Sir, U sure do deserve the math Nobel Price.
sabayak 2 years ago
You sir, are a genius and deserve a Nobel Peace Prize haha.
sambam22031 2 years ago 46
@sambam22031
i second this lolz
1Jivan642 1 year ago
bahahaha my math teachers so dumb :)
lupiter69 2 years ago
Thank You! Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!Thank You!
TheMonicaadame 2 years ago
thank you so much.
wenmadri 2 years ago
This made me learn Trig so quickly, you're so awesome. (y) I need to cram a year's worth of Math in my head in less than 10 days to pass the AP Math exam.. Wish me luck. T_T
raindropz24 2 years ago
We know who wears the trousers here lol Thanks for the help
batista981 2 years ago 4
Its officially 6 in AM and i am learning trigonometry and i love it, thanks for teaching.
Death1Crushed1Jaguar 2 years ago 2
MY favorite part was when you said "then i will go attend to my wife"! that is the cutest thing ever. 3 thumbs up! thanks for the trig help too.
jennifer18jasper 2 years ago 10
This comment has received too many negative votes show
I feel as though my brain is operating through time and space, in a seperate dimension, and I am like God with powers over matter and energy.
DanielKovach 2 years ago
Radians are used because it is both a unit of angle and of distance. This matters when you start to graph because you use it for both the angles and the X & Y coordinates on a graph.
deezynar 2 years ago
Great video! You should do one on graphing these bad boys as well. :]
squirldude 2 years ago
I've been trying to dust off my old calculus skills and discovered that my trig skills were all corroded, too. I want to thank you so much for the lesson!
I can't wait to watch your other videos!
Keep smilin',
annie
amjPeace 2 years ago
This helped me, thank you.
kenhermanz 2 years ago 2
math > women. FTW
pokaymahn 2 years ago 146
@pokaymahn Can't get laid
midnightanother 9 months ago 5
THANKS ALOT yo this helped
zerogunner 2 years ago
Im starting to believe u are my hero! im takin chem 1 and trig this semester in college, and am having a hard time.. and you are saving me in both subjects. i love ur humbleness in teaching- you accually act like a human, not a stuck up know it all teacher! thanks khan,, ur da best of da rest!
MissZuzable 2 years ago 6
It's amazing how you can be a math expert and still forgets the formulas except the basic ones. You gave me hope because I am also like that I usually remember the basic formula and forget rest and have to rewrite the basic formula everytime to reach other formulas. So I always thought to be math expert you need to remember everything but you proved otherwise. Thanks a lot. I love watching your videos.
cheeni0 2 years ago 6
I was having some difficulty gaining intuition to the relationship between radians and degrees. I came up with this formula to help me remember.
X(1 degree) = (pi / 180 radians) x (equals multiplied by equals give equals)
X degrees = (x pi / 180) radians so
45 degrees = 45 pi / 180 radians so 45 degrees = 1 pi / 4 radians.
Thanks again Sal! Peace.
truami 2 years ago
so 1 radian is 57.295 degrees?
asseeninYOURDREAMS 2 years ago
that last example is incorrect:
30 Degrees is 150 times less than 180 deg so 150 times less than 1 = 1/150
so 30deg = 1/150
9578755 2 years ago
I ment 180/30 = x
And 1/x = 0,375
9578755 2 years ago
30° * 150 = 12 full pizzas and a half mate.
30° * 6 = 180° so the last example is correct.
Enjoy your magically multiplied pizzas.
Metropolitian 2 years ago
this is amazing.. great tutorials you've helped me a lot thank you =] everything makes sense now man!
bosteador 2 years ago
Ha! You said "Oh my wife is home," like you were gonna get busted for teaching trig. That's funny.
Great videos
jmk1a1 2 years ago 116
@jmk1a1 lol "Sal are you teaching trigonometry again >:(" haha
LuisRC91 1 year ago 4
@LuisRC91 "Oh, Honey it's not what it looks like. Trig and I are just friends. We met on the Internet!"
jmk1a1 1 year ago 4
you don't need to make any changes but you should have the wife watch this particular video, I'm sure she would think it's cute how you almost went into a panic in your eforts to "tend" to her!!as usual, your videos are clearly superior to any others of their kind!!
levimariah 2 years ago 11
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dude please buy a wacom tablet and use photoshop basic
rubent100 2 years ago
I love all your movies, ive watched most of them, thankyou, they have helped allot
TheOwenmatthess 2 years ago 2
You saved my life !
shincybee 2 years ago
i prolly should have went to class this week... bad time to skip every lesson on trig and try and pick it all up in less than 5 hours... so far im kickin trigs ass because of your vids
kschill420 2 years ago 3
Your wife just came back!!!!! Seriously dude, you should inform her that she has just interrupted a very informative and valuable moment of my life. Thanks anyway.
Laranzava 2 years ago
best tutorials on the web
wb678 2 years ago 2
great shit helped me pass my test in trigonometry :))
blue26dog 2 years ago 3
thanks man. i really need to know this for my math exam
EpicVoid 2 years ago
This video saved my life!
Ipredictariot9 2 years ago 2
lol you guys! just chill man... y so agro dawg... just watch learn and pass mathematics niggas!
nurliverpool 2 years ago
well said ahha
malm1231 2 years ago
John 3 :29 GO FUCK YOURSELF
I made that one up myself (thank you very much)
rockmebaby20 2 years ago
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Ecc 12:11-14 The words of the wise are as goads, and as nails fastened by the masters of assemblies, which are given from one shepherd. And further, by these, my son, be admonished: of making many books there is no end; and much study is a weariness of the flesh. Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man. For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
ReadPsalms1 2 years ago
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Get a fuckin life
dumbass
rockmebaby20 2 years ago
thanks alot man. i have finals tomorrow and our teacher told us he need to perfect radians and degrees and i just did
Cobija13 2 years ago
you are a fuckin godddddd (A)
rockmebaby20 2 years ago
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Why do you speak such filth? Wash your heart!
ReadPsalms1 2 years ago
Shutup you stupid christian bastard
Dont think you own the word god
Anyone in the world is aloud to praise what they want
And the last think we need is a sceptisict who is trying to start a superoirity contest :|
rockmebaby20 2 years ago 2
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Mar 7:20 And he said, That which cometh out of the man, that defileth the man.
Mar 7:21 For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
Mar 7:22 Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:
Mar 7:23 All these evil things come from within, and defile the man.
ReadPsalms1 2 years ago
dude, the guy didn't even capitalize god. I mean, all he had to do was add an "a" and he would've been fine. Who knows, it might've even been a typo.
Not flaming ya, it's just that this is a very skilled interesting teacher, let's keep it down and learn.
bajjjer 2 years ago
Buns
wemoocs 2 years ago
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this is scary if u read this this far u will die in 10 days if u dont send to any 15 videos in 2 hours SORRY x .
chevelledude888 2 years ago
thanks this will help me ALOT
Leeham24 2 years ago
oh, well then I am smarter than I gave myself credit for. I can always find the long decimal answer for any radian. I just thought every answer had to be given in terms of a pi equation and it just seemed like that would be really a big pain in the butt for random angles. I went from learning the degrees/minutes/seconds back to radians where I was barely able to express 45deg. lol I guess I just overreacted out of frustration. Thanks!
djscottferguson 2 years ago
So... every example I find is always with the simple angles like 90, 45, 30 etc... what happens for like 33 deg or some odd random angle that requires pi's denominator to be a decimal??? Maybe I'm just dense, but I am having a lot of trouble figuring this whole radian measure thing out. I can calculate answers to the more odd angles, but then I will get a long decimal sometimes and I get all confused. Any advice?
djscottferguson 2 years ago