7. What is the measure of one interior angle of a regular dodecagon? A. 1800° C. 150° D. 120° B. 180° 8. What is the measure of one of the exterior angles of a regular octagon? A. 360° C. 90° B. 180° D. 45° 9. The sum of the measures of the interior angles of a regular polygon is 2880°. How many sides does a polygon have? A. n = 20 C. n = 16 B. n = 18 D. n = 12 10. In a triangle, the ratio of the three interior angles is 4: 6: 8. Find the measure of each angle. A. 72°, 108°, 144° C. 90°, 60°, 60° D. 80°, 50°,50° B. 40°, 60°, 80°​