Question

What's the radius of a circle with an area of 64 square feet?

Answer 1

Area =
`\pi r ^(2)`
64 =
`\pi r ^(2)`

`(64)/( \pi ) =r^2`

`r= ( √(64) )/( √( \pi ) ) = (8)/( √( \pi ) )`

If you want the denominator rationalized, the answer is
`(8 √( \pi ) )/( \pi )`