if a right circular cone has a volume of 15 cubic feet and a radius of 3 feet, what is the height of the cone?

a. 3 ft.
b. 5 ft.
c. 8 ft.
d. 2 ft.

Me i've asked this question 3 time asapright triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.