The volume of a cone is
V = (1/3) π r² h
where r = radius of the base
h = the height.
The volume of the frustum is
(1/3)π(7.5²)(11+8) - (1/3)π(3.5²)(8)
=(1/3)π(7.5²)(19) - (1/3)π(3.5²)(8)
The 3rd choice is the correct answer.
Answer:
[tex] \frac{1}{ 3} \pi (7.5^{2})(19) - \frac{1}{3} \pi (3.5^{2})(8)[/tex]
