Question

What is the diameter of a circle with area of `18pi` `ft^2`?

Answer 1

`6sqrt2pi ft`

Explanation:

Area of a circle `= pir^2`

`18pi = pir^2`
`18 = r^2`
`r = sqrt18 = 3sqrt2`

Perimeter of a circle `= 2pir`

`2pir = 2pi * 3sqrt2`
`= 6sqrt2pi`