Claim: Having a sum of its interior angles equal 3240 degrees, an Icosagon type polygon (a plane figure), has a variety of related polygons.
Evidence: The sum of any icosagon's interior angles is 3240 degrees. 162° 144° 126° 108° 90° 72° 54° 36° 18° 0° 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.