Orthographic projection is a method of representing a 3D object in 2D using multiple views, and is the international language of engineers and designers. It uses top, front and side views, and each projection method has its own symbol - first angle projection shows shadows behind the object, while third angle projection shows shadows in front. Examples are provided to demonstrate orthographic projection.

1. What is Orthographic Projection?
1. Orthographic Projection is a
method of representing a three
dimensional object on paper
using several two dimensional
views.
2. It is the international language of
Engineers and Designers

2. How do I know which method is
being used?
Each method has its own symbol and they are
as follows
First angle projection
Third angle projection

3. How do I draw this symbol?
The recommended proportions for the symbol
are as follows

4. Based on 3 basic views :-
Top view (seen from the top of the object)
Front view (seen from the front of the object)
Side view (seen from the side of the object)

5. 5
First Angle Projection
 The shadows of the object are cast onto the plane behind
the object
SIDE VIEW FRONT VIEW
PLAN VIEW

6. 6
Third Angle Projection
 The shadows of the object are shown onto the plane
in front of the object
PLAN
SIDE
VIEW
FRONT VIEW

7. Some Orthographic Projection’s
Example