What is 20 sided polygon?

A 20-sided polygon is called an icosagon. It has 20 sides, 20 angles, and 20 vertices. The sum of the interior angles of an icosagon is 3240 degrees. Each interior angle of a regular icosagon measures 162 degrees. The formula for the sum of the exterior angles of any polygon is always 360 degrees, so in the case of an icosagon, each exterior angle measures 18 degrees.

Some famous examples of objects or symbols that have a 20-sided polygon include the 20p coin in the United Kingdom, the United States Department of Defense's 20-sided metal identification badge, and the d20 die used in role-playing games.