Question

An equation is given.

Answer 1

Answer:

r = $\sqrt{\frac{A}{4\pi } }$

Step-by-step explanation:

Given

A = 4πr² ( divide both sides by 4π )

$\frac{A}{4\pi }$ = r² ( take the square root of both sides )

$\sqrt{\frac{A}{4\pi } }$ = r