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Definition: pentagon from The Penguin Dictionary of Mathematics

A polygon that has five interior angles (and five sides).


Summary Article: pentagon
From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Five-sided plane figure. A regular pentagon has all five sides of equal length and all five angles of equal size, 108°. It has golden section proportions between its sides and diagonals. The five-pointed star formed by drawing all the diagonals of a regular pentagon is called a pentagram. This star has further golden sections.

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Angles in a polygon

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