Any polyhedrons such as a cube is a non polygon
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I believe the fewest number of sides in a planar, non-convex polygon is four.
Yes, a ninja star is a polygon. A polygon is a closed shape made up of straight line segments, and a ninja star typically has multiple straight edges and vertices. Specifically, a ninja star is often in the shape of a star polygon, which is a type of non-convex polygon with acute angles between its points.
A polygon is any closed shape with five sides
Regular polygon is equilateral and equiangular. Irregular polygon is non-equilateral and non-equiangular.
An internal angle of the polygon.