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C. 9
D. 10
7. Which polygon has no interior angle greater than 180°?
A. concave
C. equiangular
B. convex
D. irregular
8. Which is the sum of the measures of the interior angles of a nonagon?
A. 1,260°
C. 1,620°
B. 1,440°
D. 1,960°
9. Which is the sum of the measures of the exterior angles of a 19-sided polygon?
A. 90°
C. 360°
B. 180°
D. 540°
10. What do you call the 2 coplanar angles that have a common side and a common vertex, but no common interior point?
A. adjacent
B. congruent
C. supplementary
D. complementary