Twelve. The number of sides and vertices in a polygon are always the same.
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It will have 12 sides
it has 12 vertices
12 points * * * * * A decagon has 10 vertices (points) and 10 sides. A polygon with 12 is a dodecagon.
10 ... any polygon it is 2 less than the number of sides or vertices wince they are the same.
It has 20 vertices or angles. * * * * * No! A dodecagon has 12 vertices. A polygon with 20 vertices is an icosagon.