Question

The volume of a cylinder is 63pi cubic inches. Its height is 7 inches. Find the radius of the ball. Round your

Answer 1

Answer:

3 (or 3.0)

Step-by-step explanation:

The formula for the volume of a cylinder is $v=\pi r^2h$ where $v$ is the volume, $r$ is the radius, and $h$ is the height. We know the height is 7 inches and the volume of 63pi cubic inches, so plugging in gives:

$63\pi=\pi r^2\cdot 7$.

Dividing by $7\pi$ on both sides gives

$r^2=9$,

and simplifying and taking the positive root leaves $r=3$.