Icosagon
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A 2D shape with forty sides is known as a tentracontagon.
That shape is called a triangular prism. A prism is made of rectangles arranged in a tube with any 2D shape at the ends. This shape determines what kind of prism it is, you can get pentagonal, hexagonal, and many other types of prism.
Its called a HEPTAGON
its called a septagon
A semi-circle.