Question

Which of the following equations can be used to solve for the radius (r)

Answer 1

i think it might be the third answer but im not sure

Answer 2

The last option is the correct answer:
`r=\sqrt{(A)/(\pi)}`

Explanation:

The area of a circle is given by :

`A=\pi r^(2)` ; where r is the radius.

Now, lets find the radius.

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

`\sqrt{(A)/(\pi)} =r`

or
`r=\sqrt{(A)/(\pi)}`

Therefore, the last option is the correct answer.