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.
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No. An irregular polygon is a polygon whose sides are pretty much out of control. They are usually not equal to any other one side. So, no, a star is actually a REGULAR polygon.
Yes it is.
decagon
Decagon
yes, it is closed