dodeckagon
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A dodecagon is a polygon that has twelve sides. A regular dodecagon has twelve internal angles of 150 degrees each.
12 sides, 12 angles, 12 vertices
A polygon is a shape with multiple sides. For example, a triangle is a polygon with 3 sides.
A polygon is a shape that is closed and have sides only. For example a circle is not a polygon because it has no sides.
A polygon may have any number of sides. A shape with four sides is a type of polygon called a quadrilateral.