a polygon with twenty one edges
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An icosagon is a 20 sided polygon that has 20 vertices which is the plural of vertex
An icosagon is a two-dimensional polygon, not a three-dimensional figure. An icosagon has 20 sides - while an icosahedron has 20 faces.
Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?
an icosagon is a 20 sided polygon not a Big Fat Dick
It is not a solid figure because an icosagon is a polygon with 20 sides