posted by CAITLIN D. .
The exterior angle of a regular polygon is the angle formed by an extended side and the adjacent side.
a)what is the measure of each interior angel of a regular pentagon.
(There is apicture on the page and each side measures 21mm)
As I said in response to a previous question, the sum of the exterior angles is 360 degrees. If all N angles are the same (as in the case of a regular polygon), divided 360 by N for the exterior angle of each.