The sum of the internal angles in a polygon is equal to (n - 2) x 180 degrees. In this case, the sum of the internal angles in an icosagon (a 20-sided polygon is called an icosagon, from the Greek word ikosi meaning 20), is equal to (20 - 2) x 180 = 18 x 180 = 3240 degrees.
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Exterior angles are 360 degrees Interior angles are 1260 degrees
The sum of the exterior angles of any polygon is 360 degrees.
The sum of all the interior angles of a regular octagon is 360 degrees.
The sum of the exterior angles cannot be 1980 degrees - it is always 360 degrees.
It is 720 degrees.