Question 952065
an icosagon is a twenty sided polygon.
comes from the greek word for 20.
it has 20 interior angles.
each angle is equal to 18 * 180 / 20 = 162 degrees.
each external angle is equal to 180 - 162 = 18 degrees.
the sum of the interior angles of the icosagon is equal to 20 * 162 = 3240 degrees.
here's everything you might possibly want to know about an icosagon.
<a href = "http://en.wikipedia.org/wiki/Icosagon" target = "_blank">http://en.wikipedia.org/wiki/Icosagon</a>