Respuesta :

Answer:

√(A/4π) = r

Step-by-step explanation:

A = 4πr²

r² = A/4π

r = √(A/4π)

Answer:

r = [tex]\sqrt{\frac{A}{4\pi } }[/tex]

Step-by-step explanation:

Given

A = 4πr² ( isolate r² by dividing both sides by 4π )

r² = [tex]\frac{A}{4\pi }[/tex]

Take the square root of both sides

r = [tex]\sqrt{\frac{A}{4\pi } }[/tex]