amazing math methods

[MrATex01]

Maybe you need that 1% for expansion.

[MrThinkagain1]

I think if one of the old egyptians explained this, it would be clearer that what he explained:

he calculated his own version of pi * D squared. this is why to get the usual pi, he has to multiply with this 4 square feet which is ... uuhhhhh... you tell

[AngelBiLove]

I just accidentally memorised 60 digits of pi, and i cannot forget it. Just as well :D

[skjimon]

em... DISLIKE

[POLKBOLK]

4/1 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 + 4/13 - .....

See the pattern? If you continue this series to infinity, the total sum will be exactly pi, you can try it out but you will need to go as far as the 50th number to get something around 3.17

[stiffex]

Obviously when using Pi to work out the design of a large pyramid, accuracy is more approx than say using Pi to work out the design of a small electronic device.

3.1 is near enough for any large designed building and im sure the Egyptians had a more accurate method for the design of their electrical machinery & power tools.

[COCOT20]

Just curious, the guy speaking, Is he french? 

[ClockNumerology]

The Value of the Messiah= 222 (english)

2:22 is opposite 10:38 on a clock face : )

Yehoshua HaMashiach = 1038 (english gem.)

The Messiah's Numbers = 1308 (english gem.)

BEAUTIFUL MESSIAH!

[zigastrmsek2]

so by calculating it by pi it comes 6.28square meters and by egyptian it comes 7 square meters

[zigastrmsek2]

in slovenian it is 2 tymes r tymes pi

but feet are doferent from meters or inches from centimeters

[hulkhogan100]

interestinggggg O.o

[TheQedqubit]

whuh ? i heard they used 22/7 =3.142857, which has "142857" in it, which is used in enneagram and vortexmath and other stuff with number&geometry magic

well at least for the big pyramid it's been said they used 22/7.

still wondering how they got that.

but interesting approach anyway(thumbs up!)

[amjan]

This video should've lasted 20 seconds to explaing the point.

[Npowell01]

@amjan

The equation goes both ways.

The creator of the video could easily argue that you should have a greater taste for detail and an attention span that exceeds twenty seconds.

Impatient people are always asking slow-paced people to explain themselves faster and less thoroughly while patient people are always asking fast-paced people to explain themselves slower and more thoroughly.

Who's correct depends on whether the situation calls for thoroughness, speed, or both.

[Npowell01]

@amjan

The equation goes both ways.

The creator of the video could easily argue that you should have a greater taste for detail and an attention span that exceeds twenty seconds.

Impatient people are always asking slow-paced people to explain themselves faster and less thoroughly while patient people are always asking fast-paced people to explain themselves slower and more thoroughly.

Who's correct depends on whether the situation calls for thoroughness, speed, or both.

[powerking221]

@brownlog86 you don't fricken say

[123Apocalypto]

There is so much sound, and to loud.

[mistergrammar]

How about just multiplying the diameter by itself... then multiplying it by .785?? pi is old news and totally unnecessary.

[Npowell01]

@mistergrammar

Pi is extremely necessary, old news or not.

Your method is great for an approximation of circumference, but if you're working with situations in which even the smallest change is an important one, pi is important.

It's the ratio of a circle's circumference to its diameter. It is the relationship they share, and one of the most fundamental relationships that can be observed everywhere in the universe. It's a number that can never be perfected, only more closely approximated.

[mistergrammar]

@Npowell01 Hi, thanks for your comment, can you please explain what Pi can do that .785 cannot?

[Npowell01]

Pi has been calculated to millions of digits. It never ends, because it is an irrational number. 0.785 is a rational number which can be expressed as a definite fraction. Having the endless digits of pi is important in situations where great precision is needed: For example, in the firearms industry, where arcminutes (1/60th of one degree of angle) and arcseconds (1/60th of an arcminute) are used.

Also, when you're using radians, they're often expressed as fractions/multiples of pi.

[Numinds2012]

how the hell is the egyptian method off? Didn't they build the pyramids???? And arent modern day scientist still trying to figure out how they did it??? And this calculation method is very long and drawn out- most likely improper. TRY AGAIN!

[MarkKronenbergNYC]

For private home math tutoring, search "Math 1-2-3 intro"

[kiemul136]

Is this meant to be a shortcut? The Formula is so much easier.

[leon6266]

lol nice accent

[Tetinha1]

3,1415926535897932384626433827­85 thats the pi, n00b, im 1337

[mazinm2006]

it's actually less than 1 % error

[Sugamari]

nice video buddy buddy keep them coming

[beeniefide]

the mnemonic for pi is this: "sir i have a tooth complaint, it really aches alot". take the number of letters = 3.141592654

[samisealo]

@beeniefide

The 4 is rounded!!!!

Though you have be as sad as me and know Pi to 110 decimal places to notice these things or care =p.

3.14159265358979 ... etc =p.

[beeniefide]

@samisealo or you can press pi and then = on a calculator and come up with 3.141592654 as the mnemonic works out.

[LeTinctoire]

@beeniefide Too bad, 'alot' is not a word.

[beeniefide]

@LeTinctoire There's always one who has to come out and pick faults with everything and screw everything up... Why don't you just take it for what it is and shove your perfectionism where the sun doesn't shine!

[LeTinctoire]

@beeniefide Why don't you find a new mnemonic that also works for people who *can* spell?

[beeniefide]

@LeTinctoire Why don't you just fuck off and take your fucking perfect grammar with you, I don't see any of your comments getting thumbed up, leave me alone, grammar police like you are supposed to get straight A's and go to Harvard where they mingle with other pretentious sons of bitches and no-one gives a fuck, not sit around putting people down on fucking youtube where all they do is piss other people off. Cunt.

[LeTinctoire]

@beeniefide I can almost see that vein throbbing on your forehead. Are you sure anger is the correct initial emotional response to YouTube comments?

[Shit2223]

wouldnt it be more practical if you took the divided squares added them up and divided by 2 then subtracting from the area of the box's area

[Shogobg]

Actually the classic method using Pi as 3.14 gives a little error too.

[plazmotech]

π = 3.1415927 Thats all the decimals i know :)

[NitroBlastSnorter]

@plazmotech 3.14159265

[plazmotech]

@NitroBlastSnorter Opps, i thought it was a 7 after the 2

[combatxs]

for 100 miles^2, 1% error was 1 miles^2..

[game1boy1007]

@combatxs have fun drawing a circle  100miles² big

[combatxs]

@game1boy1007 dont you know the existence of ratio, terrain mapping for example.

[daelohmen]

question?? if i had 2#'s and 2 spaces i would have a total of 4 different combinations if i had 3 #'s & 3 spaces i would have a total of 27 i;m wondering why then if i had 2 numbers and 3 spaces why it doesnt equal the same its opposite 3 numbers and 2 spaces ??!!! 2x2= 00,01,10,11 2x3= 000,001,010,011,100,101,110,11­1 .......................3x2= 00,01,02,10,11,12,20,21,22

[ThommyTerneborn]

ROMA!!!

[moon8448]

this is usefully

i will use it for the proximally value result

[Icommentstupidity]

there goes the pyramids loss of orientation :) just kidding!

[johnrobieagain]

Thanks for posting the clip.

7/9 of the original square is a good approximation.

Having said this, I would like to point out that 22/7 = 3.1428... is a better approximation as the second digit after the comma is already significant (compared with 3.11).

Best regards

[guitarheroexpertNOT]

you are amazing

[BasserLoukas]

ancient greeks did these stuf for fun...

[2354101]

so did every civlization

[duncebat]

@BasserLoukas I know. They learned from the Egyptians and gave them credit as their master teachers.

[Luis0J]

pi does give you the right answer but we only use an aproximation of it, 3.14, therefore we may be very very close but never right.

[OldSchoolSkill]

This video is concise, not too slow and fairly well illustrated.

Now, can they also demonstrate exhaustion and volumetric calculations the same way? That would be a good teaching tool!

[snappyaddy]

U rule Ayman

[sycx1]

1% error is a really big difference when you get towards the size of a pyramid. maybe this is why they are all square and not circles :)

[MFJVIDEO]

1% is the amount needed to compensate for human perception

[ffddssaavvccxxzz]

الي يسمعك الحين يقول الخوارزمي ولا الخراجي ....الفراعنه ماكانو فالحين بالهندسة>>> والعلم الحديث كشف ذلك حيث ان الهرم لم يبنى الى بواسطة تسخين الطين.....المصريين مزاكرة وحفظ بس look busy>>> do nothing

[brownlog86]

asians cant speak english.

[dragonb111]

wait....I thought that the Egyptian forumla was:

Area = (d-1/9d)^2

which ends up being 256/81r or approximately 3.16 times the radius. not 3.11 as the video states...

[dragonb111]

oops.......256/81r^2....3.16 times the radius squared.....my bad...left that part out...

[onefineline]

this guy's accent is rad! lol

[DavidAreCool]

The pi version is faster and easier to learn!

[musichalloffame]

Nice video, I learned something new and that makes me feel good!

[danedaworld]

i feel special xD, who needs pi now? now i can estimate area lol, pwnage

[TeaParasite]

yeah but it's wrong =/ it's close but it's wrong...pi gets you the right answer...

[Trobit]

π almost gets you the right answer, as you said, it's close, but it's wrong, since π is an irrational number you'll never get the exact area of the circle. You can use polar coordinates and integrate the single equation "r=1", and you'll still getting wrong, since Θ goes from 0 to 2π, even if you use rectangular coordinates, you'll have that y=√(1-x) you'll have an irrational number. Meaning: There's no exact way to know the circle's area, eventhough, π * r^2 is the closest formula.

[dudeofea]

Don't add up the radiuses, it never works. Add up all the circumferences of circles of radius "x" and integrate from x=0 to x=r. You get pi*r^2 exact. Or you know just do it your way and use a trig substitution. I had to do the trig substitution and do it your way to find the area of an elispse.

[BaXeD22]

@Trobit In my opinion, your wording is wrong

Pi * r^2 is indeed the exact formula, not the closest. We will never be able to calculate a numerical equivalent, but the formula is exact

[Trobit]

@BaXeD22 yep, you're totally right, maybe I chose the wrong words, thanks for the review man!

[syedaliasadnaqvi]

@Trobit π=22/7, if we use this, we will get the exact area.

Eg; radius=7 units, then area= πx7^2=22x49/7=154 unit square, which is the exact area. =)

[Bobstew68]

@Trobit Though.. π *does* give you the exact answer. But if you shorten π to, say, ten decimals, your answer won't be accurate beyond 9 decimals if the radius is, say, 2. That's not because π doesn't give you the perfect answer, but because your approximation in this case is set to a specific accuracy.

[markmarkmark87]

excellent video ya moamen

[Sevenputput]

they egyptians were cool

[wilsparky]

come on this is hardly 'amazing' it is a simple approximation. What is truly amazing is that the ancient Greeks DID find pi!

What is amazing about someone who nearly got it right?

[pfcampelo]

i could they completely find pi if it's infinite?

[celestialnubian]

Actually this doesn't even come close to detailing the level of knowledge of the Egyptians. If you look at their engineering achievements you will see that many required measurements that were far more precise than this 9 point approximation. Approximation is fine for a common man but I sure the engineers were more precise. Just as we have computers that can calculate pi to a million digits but the common man would not need that.

[pollardrho06]

They were smart.

[TriumphantSlayer]

really amazing, they were damn smart in the old days^_^

[Mekii90s]

cool.. ^^

[ImTheKobold]

Beats the heck out of remembering the formula. This is a pretty awesome video.

[jupa4791]

The audio in English says that "the original square had an area of seven square feet." The text shows the correct area of the original square: four square feet. The creator of this excellent video may want to edit the audio version to reflect the correct text.

[moomeen770]

many thank for your kind comment

i will edit it

many thanks

[YTMrVulcan]

@moomeen770 Did you manage to edit this video itself? I would have thought that you'd need to upload a new video.