anything that has more than nine sides is called the number of faces, in this case 20, with agon added to it. so a figure with twenty faces or sides is called a twentyagon.
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A geometric figure with a polygonal base and triangular sides is called a pyramid.
The regular solid, with 20 identical equilateral triangular faces, is called an icosahedron.
A rectangular prism.
a geometric figure having a specified kind or number of faces.
A pyramid with a square base.