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# What is a polygon?

A polygon is a closed, 2-dimensional (planar) shape made up ofthree or more straight line segments connected end to end to end. By this definition, triangles, quadrilaterals …and pentagons are allexamples of polygons. Circles (etc.) are not, as they are notcomposed of (straight) line segments. Note that the shape can beconvex (which we're used to) or concave, meaning that all thestraight line segments may not lie along a "perimeter" but can "goinside" and "come back out" to form the shape. A plane figure with at least three straight sides and angles, andtypically five or more. (MORE)