I do not no how about you find out what a polygon is then count the sides
-A
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Not all are. Not only is it a concave shape, but the interior angles can vary. For a polygon to be regular, it must be equilateral and equiangular.
A pentagon has 5 sides whose midpoints form a star shape.
A polygon is 2 dimensional shape whereas a non polygon can be 3 dimensional shape
A non polygon is a shape that doesn't meet the requierments to be a polygon. In order to be a polygon, a shape must have no curved lines and must be a closed shape.
The star is a polygon, but not a simple one. It is not simple because parts of the lines forming its boundaries are inside the star. The outline of a star is a simple polygon.