A pentagon.
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A pentagon has five sides and five angles.
A regular pentagon.
We don't know what a pentygon is. "Pentagon" means a figure with five sides. Since it has five sides, no pentagon has four sides. A "quadrilateral" has four sides. And pie are square.
A polygon is a 2-dimensional closed figure that has at least three sides. A pentagon is a 2-dimensional closed figure that has five and only five sides, so it is a kind of polygon.
Irregular pentagon.