What is 1st angle and 3rd angle projection

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1st angle and 3rd angle projection are two methods used in technical drawing to represent a three-dimensional object on a two-dimensional surface.

1st angle projection is commonly used in Europe and Asia, while 3rd angle projection is commonly used in North America.
In 1st angle projection, the object is imagined to be in the first quadrant and the views are projected onto the planes surrounding the object.
In 3rd angle projection, the object is imagined to be in the third quadrant and the views are projected onto the planes behind the object.
Both methods involve creating orthographic projections, which show the object from different viewpoints and angles.
The choice between 1st angle and 3rd angle projection depends on regional standards and conventions.

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