What is the difference between first angle projection and third angle projection?

Question

Accepted Answer

First angle projection and third angle projection are two methods of creating 2D drawings of 3D objects.

First angle projection is commonly used in Europe and Asia, while third angle projection is commonly used in North America.
In first angle projection, the object is placed in front of the viewing plane and the orthographic projections are drawn behind it.
In third angle projection, the object is placed behind the viewing plane and the orthographic projections are drawn in front of it.
The symbol used to indicate the type of projection is different for first and third angle projection.
It is important to know which type of projection is being used when interpreting engineering drawings.

Popular interview questions of Assistant Manager