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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.​