It is a 5 sided shape with the properties that any line segment between two vertices of the pentagon remain in the boundaries of that pentagon. It generalizes to polygons.
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It can be either.
it is a shape with 180degrees or less
A square is not a pentagon. Pentagons have 5 sides, squares have 4.
520 Degrees
If the polygon above has 5 sides is it a concave or a convex