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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The Penguin Dictionary of Mathematics

A symmetrical five-pointed star polygon formed by drawing all the diagonals of a regular pentagon. See golden section . ...

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Collins English Dictionary

n 1 a star-shaped figure formed by extending the sides of a regular pentagon to meet at five points 2 such a figure used as a magical or symbolic

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Teach Yourself: Mathematics: A Complete Introduction

A polygon is a shape with three or more straight sides. To calculate the angle sum of a polygon, split it into triangles. For the five-sided polygon

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