The two angles depicted in the image are vertical angles since they are a pair of opposite angles made by two intersecting lines. Vertical angles are always congruent meaning that the two angles in the picture are equal. Therefore:
The radius of circle C is also 3 times greater than the radius of circle D. The area of circle C: A C = (3r)² π = 9 r² π The area of circle D: A D = r² π 9 r² π : r ² π = 9 Answer: It is 9 times the area of circle D.
