A polygon.
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It is a polygon that is a closed plane figure with 3 or more straight lines.
A polyhedran is a 3-dimentional figure that has sides that are polygons. A polygon is a 2-dimentional figure with straight sides, a closed side.
any closed figure made up of 4 straight sides.
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
a figure, esp. a closed plane figure, having three or more, usually straight, sides.