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((20 - 2) x 180) / 20 = 162 Therefore, the measure of a single internal angle of an icosagon is equal to 162 degrees.
An icosagon has 12 vertices.
The sum of the external angles of any regular polygon is equal to 360. Therefore, a single exterior angle of an icosagon is 360/20 = 18 degrees.
an icosagon is a 20 sided polygon not a Big Fat Dick
The sum of the interior angles of an icosagon is 3240 degrees, each angle of a regular icosagon being 162 degrees. * The formula for the sum of an n-sided polygon is 180 (n-2). 180 x 18 = 3240