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.
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If it is a regular polygon then each exterior angle is 360/20 = 18 degrees
It has 360/20 = 18 sides
360/18 = 20 sides
360/18 =20
360/20 = 18 degrees.