The sum of the interior angles of a polygon is (n-2)*180 where n is the number of sides. In this case n=35.
(35-2)*180 = 33*180 = 5940.
Because this is a regular polygon all the interior angles are the same. The measure of each angle is the sum of their measures divided by the number of angles.
5940/35 = 169.71 degrees for each interior angle.
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