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The interior angle of a 13 sided polygon can have any value between 0 and 360 degrees.
Providing that it's a regular polygon each interior angle is: 1520 18' 27.69''
1980 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.
If an interior angle is 55 deg, the corresponding exterior angle is 125 deg. This has nothing to do with the number of sides of the polygon (unless it is a regular polygon).