### Topic Page: Pentagon

**pentagon**

*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.

essays

Angles in a polygon

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