What is the Deference Between the Frist angle and third angle Position

Question

Accepted Answer

First angle and third angle positions are two different methods of representing a 3D object in 2D engineering drawings.

First angle projection is commonly used in Europe and Asia, where the object is imagined to be in the first quadrant of a Cartesian coordinate system.
Third angle projection is commonly used in North America, where the object is imagined to be in the third quadrant of a Cartesian coordinate system.
In first angle projection, the top view is below the front view, while in third angle projection, the top view is above the front view.
The symbol for first angle projection is a right-angled triangle with the vertex pointing towards the object, while the symbol for third angle projection is a right-angled triangle with the vertex pointing away from the object.

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