An icosagon has 12 vertices.
An icosagon has no edges because it is a 20 sided polygon
Just the one because an icosagon is a 20 sided polygon
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
Twenty.
An icosagon has just one flat face because it is a polygon that has 20 sides
22
it has 20 edges.
20 sides
It need not have any.