Depends on where you take your cross-section. If you look at it from the top, it's a circle. If you look at it from the side, it's a rectangle. And that's only if you don't approach it from something other than a right angle.
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If it is folded out it is called a net. It forms two circles and a rectangle.
There is no such thing.
A quadrilateral rectangle or a square
A 2D shape with forty sides is known as a tentracontagon.
Its called a HEPTAGON