Claim: The sum of the interior angles of an Icosagon type pollygon (a plane figure) is 3240 degrees, and has a variety of related polygons.
Evidence: In geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon's interior angles is 3240 degrees. In geometry, a polygon (/ˈpɒlɪɡɒn/) is a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or polygonal circuit. Form Convex polygon Compound Star polygon Compound Compound Star polygon Compound Star polygon Compound