1980 degrees
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the sum of the interior angles of a 35-gon.
180x28 is the sum of the interior angles in a 30- gon
Sum of exterior angles: 360 degrees Sum of interior angles: 2160
Sum of the angles of a regular polygon = (#sides - 2) * 180. Sum of 20-gon angles = (20-2) * 180 = 3240
The sum of the interior angles of an n-gon is found by the formula: (n-2)*(180) degrees. So a 38-gon would have (38-2)*(180) degree sum for its interior angles, which equals 6,480 degrees.