Pentagon is a polygon having five sides. It is called equilateral if all sides have the same length. It is called equiangular if all its angles are equal. Like all polygons, except a triangle, a pentagon may be equilateral without being equiangular. Or it may be equiangular without being equilateral. A pentagon is regular if all the sides and interior angles are equal. Each angle equals 108° and may be inscribed in a circle. A pentagon may be circumscribed around a circle by drawing tangents to the circle at the vertices of a regular inscribed pentagon. See also Polygon .
