polygon: Quick Facts

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Photos

Three colored polygons are shown side by side: a red triangle, a yellow quadrilateral, and a green pentagon, each labeled above with its name.

Figure 2: The points of a plane that are not on a polygon are separated by the polygon into two regions, the “inside” and the “outside.”

Figure 1: A polygon whose vertices are lattice points.

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Topics

triangle hexagon regular polygon flexagon rhombus Pascal’s triangle Heron’s formula parallelogram right triangle spherical triangle polyhedron Euler characteristic

Key People

Engraving portrait of Carl Friedrich Gauss wearing a cap and formal 19th-century clothing, with detailed shading around his face and upper body.

Carl Friedrich Gauss

German mathematician

Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.

Define It: Math Terms