The name of a 20 sided polygon is Icosagon.
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The interior angles add up to 3240 degrees
The sum of the exterior angles of any polygon and the extension of its adjacent side is 360 degrees.If the 20 sided polygon is regular, then each angle is equal so that each one is 360/20 = 18 degrees.
The sum of the interior angles of a four-sided polygon is 360 degrees.
The sum of the exterior angles of any n-sided regular polygon, including a seven-sided polygon, is 360 degrees.
Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.