What is first angle and thard angle projection

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

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 placed above the front view, while in third angle projection, the top view is placed below the front view.
Understanding the difference between first angle and third angle projection is important in technical drawing to accurately represent the dimensions and features of an object.

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