pentagon
A pentagon is a polygon with five vertices and five sides.
There are two types of pentagon:
(1) Regular pentagon
(2) Irregular pentagon.
Regular pentagons and irregular pentagons have five sides, and the interior angles of both add up to a total of 540°. The interior angles of a regular pentagon are always 108°, 540° ÷ 5 = 108°. The interior angles of an irregular pentagon are not all equal.