Providing that it's a regular polygon: 360/number of sides = each exterior angle
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360/number of sides = each exterior angle
360/number of sides = each exterior angle
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.
180 - interior angle = exterior angle
It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line