Any angle that you like between 0 and 360 degrees. Possibly excluding 180 degrees since that is just a straight line.
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Providing that it is a regular polygon then each interior angle will measure 160 degrees
The sum of the interior angle measure of a 13-sided polygon is 1980 degrees. It is solved by doing: 180(s-2) 180(13-2) 180(11) = 1980 degrees *s- meaning sides*
The interior angles of a 13 sided polygon add up to 1980 degrees
Each interior angle measures: 152o 18' 27.69''
Anything you like. Any single interior angle of a polygon is indeterminate - the only constraint is on the sum of all the interior angles.