If it's a regular polygon: 360/number of sides = each exterior angle
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The exterior angles of any polygon add up to 360.
The sum of the exterior angles of a polygon is 360o.
There are 5 interior angles and each one measures 108 degrees (180-72). Since the sum of exterior angles of any polygon is 360⁰, then that polygon would have 5 angles (360/72). So the sum of interior angle measures is 540⁰.
No matter how many sides it has, the exterior angles of a regular polygon add up to 360 degrees. So 360/17.14 = 21 sides.
Sum of exterior angles = 360 degrees Sum of interior angles = 1980 degrees