Sum of interior angles = 180*(27-2) degrees = 4500 deg.
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the sum of the interior angles of a 35-gon.
The sum of the interior angles of a 15-gon is (15-2)x180 degree which is 13x180 degrees or 2340 degrees.
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