It's often easier to calculate the external angle and subtract this result from 180 to obtain the interior angle.
External angle of a 35-gon = 360/35 = 10.2857°
Interior angle of a 35-gon = 180 - 10.2857 = 169.7143°
The formal way is to use the formula that the Sum of the interior angles = 2n - 4 right angles.....where n is the number of sides.
Sum of interior angles = [(2 x 35) - 4] x 90 = 66 x 90 = 5940
Then each interior angle = 5940 / 35 = 169.7143°
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Each interior angle measures 135 degrees
Each of the 4 interior angles measure 90 degrees
Each exterior angle: 40 degrees Each interior angle: 140 degrees
45 degrees
Providing that it's a regular polygon then each interior angle measures 156 degrees