360/(180-172)=45
The 360 and the 180 are the same every time.
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Providing that it is a regular 15 sided polygon then each interior angle will be 156 degrees
Extend any straight side of a shape. The angle made by that side with the adjacent side of the shape is an exterior angle. Its value is 180 degrees less the interior angle.
120
Exterior angle = 360/16 = 22.5 So interior angle = 180 - 22.5 = 157.5 degrees.
Exterior angles add up to 360 degrees Interior angles add up to 2520 degrees