If a pentagon is a regular pentagon, then what is the measure of each interior angle?

All sides are the same length (congruent) and all interior angles are the same size (congruent). To find the measure of the interior angles, we know that the sum of all the angles is 540 degrees (from above) ... And there are five angles ... So, the measure of the interior angle of a regular pentagon is 108 degrees.

108 degrees because there's a total of 540