What are the differences between first angle projection and third angle projection in technical drawing?

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Accepted Answer

First angle projection and third angle projection are two different methods used in technical drawing to represent a 3D object on a 2D plane.

First angle projection is commonly used in Europe and Asia, where the object is imagined to be in the first quadrant (between the object and the observer).
Third angle projection is predominantly used in North America, where the object is imagined to be in the third quadrant (behind the object and the observer).
In first angle projection, the top view is placed below the front view, while in third angle projection, the top view is placed above the front view.
The symbol for first angle projection is a square with two arrows pointing towards it, while for third angle projection, it is a square with two arrows pointing away from it.