An icosagon has just one flat face because it is a polygon that has 20 sides
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An icosagon has 12 vertices.
An icosagon is a two-dimensional polygon, not a three-dimensional figure. An icosagon has 20 sides - while an icosahedron has 20 faces.
It is not a solid figure because an icosagon is a polygon with 20 sides
An icosagon is a 20 sided polygon that has 20 vertices which is the plural of vertex
20 sides