yes, it is closed
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because the point of origin would be on an outer point and around it the walls seem to cave in making it seem concave, in comparison to a regular polygon. When checking for concave polygons always compare what you are looking at to a regular polygon
Then the point is not outside the polygon...?
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 Pentagon has 5 diagonals, they form a star inside the polygon
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