Engineering Graphics Class Module 5 _ IIT Bombay Professor _Semester 1 and 2 _ Episode 29
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00:00you
00:30So this video is regarding the next chapter, that is Development of surfaces.
00:54The first section is called the basic developments, we have included 4 questions in the basic
01:00developments in the question bank.
01:03After that, the second section is called the 5.2 section, which is called the development
01:07of solids with, sorry, the development of sectioned solids.
01:12So, in this, first we have to know the basic developments, so what is the development of
01:17surfaces?
01:18We already know the solids, so in the figure I am showing now, I have shown 4 basic solids
01:24in this.
01:25One, we know our cylinder, then two, the prism corresponding to the cylinder, the same
01:31prism coming from the same boot, so I have taken the square prism in this, then two
01:36types of pyramids coming like that, I have taken the square pyramid here, then our basic
01:44cone.
01:45So, these are the 4 basic solids, 4 basic solids, because we know the cylinder, cylinder
01:52is only one thing, its diameter and height will give the cylinder, then we know the cone,
01:58if the base has a certain diameter and height, this is the cone, these two are okay, two
02:04basic solids.
02:05Then, the next two basics are, one is the prisms, so I have taken the square prism,
02:10now we have a lot of prisms, square prism, pentagonal prism, hexagonal prism, so our
02:16prism is coming from both the sides, so there are many types of prisms.
02:20Similarly, there are many types of pyramids, this is a pyramid with a base shape only,
02:26this is a square pyramid, this is a pentagonal, hexagonal, triangular, many types of pyramids.
02:31So, these are the 4 basic solids, 4 means cylinder, cone, that is only one type, then
02:38all the prisms and all the pyramids.
02:41So, as an example, I have taken only two squares, whichever you want.
02:45So, the development of the surface of these basic solids, I mean, if the surfaces around
02:52these solids, or if the surfaces around these solids, I think I am breaking this solid,
02:59if I break this solid and make it flat, how is the surface going to be?
03:05Now we know, this is already a 3D, these 4 rectangles, if you see, in this square prism,
03:11these 4 rectangles, if I select this common edge, if I select this edge, if I cut through
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