difference between 1st angle and 3rd angle projection

Question

Accepted Answer

1st angle projection is commonly used in Europe and Asia, while 3rd angle projection is commonly used in North America.

1st angle projection is where the object is imagined to be in between the object and the observer, with the plane of projection behind the object.
3rd angle projection is where the object is imagined to be in front of the object and the plane of projection is between the object and the observer.
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 top view is below the front view, while in 3rd angle projection, the top view is above the front view.

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