First angles vs Third angle method | Orthographic projections animation 

ORTHOGRAPHIC PROJECTION
This video explains why orthographic projection is used and how the first angle and third angle methods are drawn and why second and fourth angle methods are not used.
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00:00 Introduction.
01:28 First angle method.
03:29 Third angle method.
04:46 Symbols used to represent first angle and third angle.
04:52 Why don't we use 2nd and 4th angle methods.
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