Find the sum of the measures of exterior angles, one at each vertex, of an octagon.

A. 180

B. 360

C. 1080

D. 1440

A rule of polygons is that the sum of the exterior angles always equals 360 degrees, but lets prove this for a regular octagon (8-sides). First we must figure out what each of the interior angles equal. To do this we use the formula : ((n-2) * 180) / n where n is the number of sides of the polygon