You can put this solution on YOUR website! 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. http://en.wikipedia.org/wiki/Icosagon
