Question

A=4pi r^{2} solve for r

Answer 1

Explanation:

A = 4πr² Divide both sides by 4π

A / 4π = r² Find the square root of both sides

√(A / 4π) = √(r²) Cancel out the square with the square root

√(A / 4π) = r Switch the sides to make it easier to read

r = √(A / 4π)

Answer 2

A = 4πr² Divide both sides by 4π
A / 4π = r² Find the square root of both sides
√(A / 4π) = √(r²) Cancel out the square with the square root
√(A / 4π) = r Switch the sides to make it easier to read
r = √(A / 4π)