It is not a solid figure because an icosagon is a polygon with 20 sides
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An icosagon is a two-dimensional polygon, not a three-dimensional figure. An icosagon has 20 sides - while an icosahedron has 20 faces.
A 20-sided flat figure (polygon) is called an icosagon. If it is a solid figure--three-dimensional--it is an icosahedron.
isosagon * * * * * icosagon.
Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?
An icosagon has 12 vertices.