Its is called a nonagon
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A polygon with 9 sides and 9 vertices is a nonagon
Twelve. The number of sides and vertices in a polygon are always the same.
A polygon with three vertices and three sides is a triangle. A polygon with four vertices and four sides is a quadrilateral.
It will have 12 sides
A polygon has the same amount of vertices as it does sides, so it would have 7 vertices.