A 13 sided polygon interior angles add up to 1980 degrees.
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There are: (13-2)*180 = 1980 degrees
If the interior angles of a polygon add up to 1980 degrees then it has 13 sides
The sum of the exterior angles cannot be 1980 degrees - it is always 360 degrees.
1980 interior degees
Altogether they add up to 1980 degrees.