This is the formula for the volume of a cone:
V = (1/3)B•h
B = The area of the circle base (πr2)
h = height of the cone
B= πr2= 36π
r2= 36
r= 6
The height of a cone is equal to three times the radius of the base according to the problem:
h = 3r
h= 3(6) = 18
Now solve for the volume of the cone:
V=(1/3)(36π)(18) = 216π cu. cm.