How many sides does a regular polygon have if the measure of each interior angle is 120°? A 4 B. 6 C. 9 D. 12 Performance Task Solve the following problems and show your solutions. 1. The measures of two angles of a quadrilateral are 100' and 120°. If the other two angles are congruent, find the measure of each. 2. The measures of the four angles of a pentagon are 95°, 110°. 85, and 126° respectively. Find the measure of the fifth angle.