1980 interior angles and 360 exterior angles
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The 13 interior angles of a 13 sided polygon add up to 1,980 degrees
The sum of the interior angles of a n-sided polygon is (n-2)*180 degrees. So for 13 sides, the sum is 11*180 = 1980 degrees.
1980 degrees.
1980 degrees
13 * (180 - 360/13) = 1980 degrees