A icosahedron.
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A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.
A polygon with 20 sides is called either a 20-gon or an icosagon.
A polygon with 20 sides is an icosagon.
It has 360/20 = 18 sides
An icasagon is a polygon with 24 sides. The name comes from the prefix "ica-" which indicates 20, and "-sagon," which denotes a shape or polygon. Therefore, an icasagon has a total of 24 edges and vertices.