What is the shape of a door? P.S It is not a rectangle.

Question

I learned a few years ago that the shape of a door is not a rectangle. What is it?

Answer 1

In PLAN VIEW, most door shapes are rectangles, i.e. they have a rectangular facade. Of course there are some doors that have other shapes, e.g. a semicircle at the top of a rectangle.

 

If your statement claims that a rectangular door is not a rectangle because it's actually a 3 dimensional object, that's true--a rectangular solid called a rectangular parallelepiped.