How do you distinguish First Angle Projection and Third Angle Projection by seeing Engineering Drawing?

Question

Accepted Answer

First Angle Projection and Third Angle Projection can be distinguished by the position of the object and the projection planes.

First Angle Projection places the object in the first quadrant and the projection planes are placed between the object and the observer.
Third Angle Projection places the object in the third quadrant and the projection planes are placed behind the object.
In First Angle Projection, the views are obtained by projecting the object onto the planes of projection.
In Third Angle Projection, the views are obtained by projecting the planes of projection onto the object.
First Angle Projection is commonly used in Europe and Asia, while Third Angle Projection is commonly used in North America.

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