 Now, to draw this you guys some of you guys put in some hard work and whatever the score you would see over there is going to get added up as extra credit in your total. So, you have taken the pain therefore, there will be some gain for you. So, those who did not those a bit alright. So, I will start from you know bottom up. So, this is the first result was not quite sure what he did not get much marks, but that is ok. Second is too large and the vanishing points and station point and horizon line they were not clear. Third Virend is he there Virend ok. So, maybe you take you took me too literally. So, I said well I mean just stand by your door and see how your room looks like. So, you stood a little far from the door, but that is ok. You know as an art it is wonderful it is great I mean. So, possibly Virendra is possibly Virendra is standing over here and he is honest he shows what he sees. Deepak he took me too literally. So, he went for Deepak Kumar is he there Deepak Kumar. So, not only was he standing a little away from his door maybe he went all the way up to the terrace of his hostel and he is looking at his room from there. So, that is ok that is also art quite detailed, but I wonder what this is is this one of the home assignments or class work assignments. Jitesh Mohan Kumar are you there was this a homework assignment or class work assignment or. But your drawing is quite detailed wonderful, but that was a one point perspective. What he showed was a one point perspective good enough. So, in some proportion the marks that you have gotten will get added up to your total. So, you will only gain Ravi Kumar is he there again a single point perspective, but one point. Hardik Soni not there gone home pretty nice I mean he started out with a side view a profile view a top view. And he pretty much drew this perspective two point perspective, but he decided somehow work with lines you know a table would have a little. So, it would not have any thickness, but line, but that is ok. So, which one this one no, but if you look at this table. So, these are possibly rods that is ok that is ok. So, Akash Deep alright. So, you also did a pretty nice job I mean started with the top view profile view detailed drawing of your room pretty nice. So, quite a few sense that we have Samir Raja pretty nice, but again I mean looks like you are working with the lines you could have shown some thickness that is ok. Shubham Agrawal nice effort Naveen pretty nice effort detailed and you prefer to shade. So, nice. So, you know just look at the drawing and appreciate the amount of hard work some of you have put in this and I really appreciate that. So, thanks very much Aman Rusya Aman Rusya. So, he starts with Nate pretty nice detailed drawing Ravi Raj pretty nice hike information. So, that was something that I guess had you shown that clearly could have been a little better yeah pretty nice very artistic what about the scale no that was a one point perspective that is the reason why would have gotten a yeah. So, this is a two point was it which one yeah, but it hardly shows anything yeah well the scale is too large, but then where are the vanishing points and by the way. So, I did not create them. So, I asked one of my colleagues to help me out with that. So, alright. So, missing things yeah that information. So, and then of course, the details top view and the profile view had you shown that you know some things would have been a lot better, but still good enough I mean eight pretty artistic Sunil Chaudhary alright. So, pretty nice again. So, start with details and end up with a pretty nice figure once again I guess you tend to choose lines yeah. So, had you shown some thickness things would have been a little better ishkumar gen pretty nice. So, he is the first nine no no no there is a there is a story behind this this person used two sheets. So, this was the background sheet that he used and his second sheet was this pretty nice. So, I am very glad to see some artists coming out of this class. So, pretty nice yeah. So, looks pretty nice, but somebody else went. So, the picture is not very clear, but if you look at the sheet I am not sure if we have the sheet here Mohit call it luck or what I mean Sonu has a pentagonal room. So, she starts with a pentagonal top view pretty much all the detail information the profile view here and one thing that possibly went to her favor was that she was able to show that you know there is another vanishing point the third vanishing point. So, technically it was pretty good and it is pretty neat you know for quite some time I was pondering what should I give and the best thing that I could give you is which I am giving any time I am giving yeah. So, moments a well let me wait till your exam exams are over I will be and trust me I will be eager I will be eager to give as many as possible, but I need to support for that. So, if you do well in your exam exams I will be very happy to give you is and many a stars, but if you do not do well in exam I will not have that support that I am looking for. So, if you promise me that support I promise you the great you give me support I give you great yeah ok. So, auxiliary views so quite a few would have gone home I believe that is ok we discussed a simple example last time. So, many of you were not here, but for your benefit we go through this again. So, look at where we are now in the week we are in the 11th week we have after this four more lectures to go to on interpretation solids and to on development ok. So, you will have to bear me for four more hours and the exam. So, this is the example problem that you will be solving in number 11 I believe I am number 11 ok yeah. So, you already have the solution if you do not I will go through it. So, we need to figure out the few of the subject and the top view of the subject and the trick is that two of the planes that you see they are inclined they do not get aligned with either the horizontal or the vertical. So, it becomes difficult for you to draw the conventional autographic view of this drawing. So, what you do you take the help of auxiliary plane get the true shape of the object on these planes and transfer that shape correspondingly in your front view and the top view ok. So, the centre part of the object is not very difficult to draw. So, maybe I will just run through that. So, it is a block some dimensions some protrusions coming out from the right from the left and of course, this angle is given I think 45 degrees. So, this angle is given. So, perhaps I can get the thickness of the planes on both ends ok. So, this is a base this is a primer and then I project some features in the top view that I can. So, in from the top it is going to be a hollow box in a way with some thickness alright. So, hidden lines centre line and if you want to and you have to do that. So, to be able to capture the true features on this plane and on plane you have to draw you know those features in the corresponding auxiliary views. So, if you flip this plane by 90 degrees you will get the true features here and likewise if you flip this plane by 90 degrees you will get the true features over here. So, here it is pretty much like a slot and well it is a semi-circular slot and here you have a t slot. So, let us try to get that where here why is there a centre line should be there should not be there should not be there why should not be there it should not be there you have an eraser you will just erase it. So, ignore that ignore that alright. So, coming back to the true features on that plane. So, this length is going to be 30 here to here is 30 this would be about you know 40. So, this total length is 40. So, you have to draw a few arcs on both ends here and here. So, get this slot not very difficult get the arc get the arc and you have the true features on this plane on the auxiliary plane. The second one is it ok for me to have the centre line here alright and of course. So, once we have this thingy here in the auxiliary view I will have to come back and update my top view update my front view. So, I will have a dashed line corresponding to this feature and on the right hand side again something very similar drawing that is not going to be very difficult. So, it is a t slot that we have and once I have this auxiliary view then I come back to my top view and I update that. So, have corresponding hidden lines alright. So, is it ok for me to have a centre line here also yes or no why not why symmetry. So, this centre line is representing symmetry alright. So, is my front view done am I done with the front view am I done with the front view or do I need to do something else yes no no answer am I done with the front view good not yet how about this line how about this line what would this line correspond to no which one which one this one or this one this one should be hidden should be solid I am ok I am ok right should be hidden line fine. So, yeah so because you have flipped this thing like so on and likewise you will have a line correspond to this. So, once your auxiliary views are finalized and through it start working with the top view and this is where I would need your attention. So, pay attention this is where things get complicated because transferring these features from here to top view is a little tricky. So, first get the projections match the projections yeah. So, corresponding to this corner here you will be seeing a solid line correspond to this one you will be seeing a dashed line centre line should I have a centre line here because the object is symmetric with respect to that pay attention we will transfer these features on to this feature. Now, you must have studied something way back may be 5 6 lectures ago how do that something very similar. So, this is one of the views a hinge line second view third view right. So, do you recall how do we transfer distances do you recall how do we transfer distances exactly the same thing all right. So, I am going to be projecting this feature up and this is the tricky part I have not yet identified the hinge line that would separate these two features. And how would I want to do that I already have the hinge line here because if I do not do this correctly then I will mess up the transfer of features from this auxiliary view to here. So, you have to be able to locate this hinge line properly because if you do not then you will mess up your transfer of points from this auxiliary view up to this top view. Now, what I do is I make this with respect to this hinge line from this centre line I locate this point over here and I draw a little hinge line. Now, this hinge line is local in the sense that this hinge line represents only the relation between these two views and. Now, once I have located the hinge line over there rest becomes simple I will measure this distance I already have the projector up over there I will transfer this distance over there likewise I measure this distance I transfer this distance over there and what am I doing yeah now I am measuring this distance my projector is here. So, I am projecting the top face now. So, I am projecting this face now not this face measure distances transfer distances and then project this guy up over there measure this distance transfer that distance once I have all those distances over there it is easier for me to make this T why are we you can yeah. So, what you are saying is these distances they remain the same is this what you are saying that these distances remain the same it is this distance that gets foreshortened yeah you could do that if you want to do if you want to draw this directly you could do that. So, I am just explaining the procedure or a little more complex looking objects it may not be feasible for you to draw it the way you want to. So, having worked on the object now working on the bottom face of the object exactly the same thing a part of T be visible and a part of T be invisible. So, this part inside the previous T is going to be visible this part is not going to be visible. So, it is going to be shown using hidden lines. So, this part of T is right there where am I now how about this arc Kevin that you cannot draw directly. So, you have to take projections and you have to measure distances precisely. So, look at this arc transfer this arc over there from the top view from the front view to the top view. So, discretize that arc into a number of small segments do you see these lines do you or you do not you do not. So, there are a few lines over here. So, discretize this arc measure distances from the hinge up to different points on the arc drawing projectors from here measure these distances like green lines trans them over there here here here right. So, once you get those distances then becomes a little easier for you draw the arc. Likewise on the top draw the horizontal lines is this going to be visible or this going to be hidden visible how about this is this going to be visible as this is going to be hidden. And would the arc corresponding to this plane here we shifted to the left right shifted to the right. So, once you have gotten this arc over here if you are smart you can just directly shift that arc to the right by the requisite amount or you can take the projections from here and get that arc at its proper location. So, the top view becomes a little difficult to work with likewise on the left same thing exactly the same thing. So, you have this edge drawn. So, the edge corresponding this corner will be visible how about this corner visible and visible hidden. And then start taking projections start measuring distances transfer distances and get your top view in order this is for the arc likewise on the top that part is going to be visible how about this arc exactly the same procedure discretize this arc into a bunch of points measure distances from this arc from the hinge line and transfer those distances on to your top view likewise on the top join these guys. This is for the top face this for the top face how about the bottom face yeah why is this local and why is this local true true true. Then I will have to be a little careful because then I will have to figure out the appropriate or proper location hinge line and this hinge line. So, what I am saying is if I locate this hinge line independently if the location of this line is again independent from this. Then the choice of this would depend on how I have located this hinge line and the choice of this hinge line would how I have located this hinge line you can can you directly measure distances. So, if you do not want to measure the distances from this hinge line and rather yeah I am come to that. So, let me see if I have gotten you right. So, if you do not want to measure distances from this hinge line rather if you want to measure distances of these points from this edge you can use this edge as reference and for the transfer distances accordingly. Is this what you are pointing at is this what you are aiming at or yeah you can which is what I am saying you can, but you will have to be a little careful. So, if you want to show a common hinge line that separates this view from this view you can, but when you do that the location of this hinge line and this hinge line they will be related this is what I am referring to. So, after the mid-sem break you can you are going to be working on this example. So, try it out try it out. So, if you choose to represent both these hinge lines by a single hinge line then make sure that these distances they are properly correlated at this time they are independent you see what I mean or maybe we will discuss this yeah alright. So, how about the features on the bottom face this face here identical procedure. So, of course, like you see this arc over here you would also see something very similar at the bottom face, but if you look at the top view this arc will get shifted inward and since this is at the bottom this would be shown using hidden lines. Likewise the inner slot over here this will get shifted inward corresponding to the bottom face and it will be shown using hidden lines did I miss out on anything else is everything there alright. So, because I am leaving you 10 minutes earlier you are too bored with TA 101 is it yes sir too bored with TA 101. Why are you bored time consuming if I have made you work a lot if I have made you work a lot I am not sorry about that no, but it is not therefore, it is my fault I am making you work hard. Come on you are learning so many things isn't it I will give an example. So, think about this why come on you are fresh from your J exam you know SL Lonie by Hark you know all your physics books Ressnick holiday is it or Ressnick holiday or is there any new book that I am not aware of SC Verma ok. Oh yeah fine. So, given 3 points on a hyperbola given 3 points on a hyperbola let us say this is your axis and your hyperbola is symmetric about this how do you construct it hyperbola pardon my drawing I mean I should have been should have been more like that given 3 points on a hyperbola how do you construct it I am not interested in the algebraic solution I am interested in the geometric solution how do you construct that think and analyze if you have done your TA 101 well may be I can expect a solution from you guys another 5 or 10 minutes, but if you have not they are symmetrical, but I need only 1 of these points not 2 how do you construct this geometrically given 3 points on a hyperbola ish what does it mean what does it mean ish ish then it should have been I SH that is ish ish and what is yeah yeah yeah yeah yeah yeah yeah come on come on you have a hyperbola problem to solve. So, how smart people in front of me people from computer science electrical mechanical mathematics BSB all of you guys have done S. Aloni pretty nicely I mean pretty thoroughly 3 points on a hyperbola how do you construct it geometrically yeah huh French curves come here come here yeah yeah yeah yeah 4 more guys to lift him 4 more guys to lift him French curves why not use a compass and draw an arc man they will be more accurate I am not saying that anybody with a solution yeah step out step out triangle yeah a piece of chalk take a piece of chalk and explain it this point will lie on a hyperbola well these 3 points are lying on a hyperbola itself yeah yeah. So, these 3 points already there on the hyperbola how would this point lie on a hyperbola yeah fine so construct it construct it yeah anybody else anybody else and they even fix distance from a point draw from cyclic circles from this point and this point. So, the point where they intersect the corresponding concentric circles those will give the points to the corresponding hyperbola sure most probably. So, can you verify that and I will take some time ok ok there is there is there is a very obvious solution now I guess I should be saying that T a 1 1 is so difficult I am absolutely no idea about these methods all right. So, so when you return and please do return after your midsem break we will talk about these interesting aspects of T a 1 1 in section and development. So, it is pretty fun lot of lot of work, but pretty fun also. So, happy holy go home.