Question

A cone has a volume of 81 cubic feet and a height of 6 feet. What is the

radius of the base?
​

Answer 1

B. r = 2

Explanation:

First start by getting your formula:
`V=(1)/(3) \pi r 2h`

Next plug in what you know:

8
`\pi`=
`(1)/(3)`
`\pi`r2(6)

Solve for "r":

8
`\pi`=
`(1)/(3) \pi`r(12) ---------> divide the pi out and multiply by 3 on both sides to lose the fraction

24=r(12) ---------> divide by 12

2=r