360/number of sides
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A regular polygon will have 360 sides with exterior angles of 181 degrees.
It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line
360/number of sides = each exterior angle
Exterior angle of ANY regular n-sided polygon is 360/n degrees...
Measure it. There is no formula for an exterior angle unless you have a regular (or equiangular) polygon. And there is no evidence to suggest that that is the case.