Which differences first angle or third angle positions

Question

Accepted Answer

First and third angle positions are two different methods of representing a 3D object on a 2D plane.

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 planes of projection are between the object and the viewer.
In third angle projection, the object is placed behind the viewing plane and the planes of projection are between the object and the viewer.
The symbol used to indicate first angle projection is a square with a dot in the center, while the symbol used to indicate third angle projection is a square with three arrows pointing towards it.
It is important for assembly fitters to understand both methods of projection in order to read and interpret technical drawings correctly.

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