Answer:
B.
Step-by-step explanation:
The whole aim here is to get r on it's own. So we have to begin by dividing both sides by pi.
V / pi = hr^2
Then, to further get r on it's own, we have to divide both sides by h. This would put it under the fraction with pi.
V/(pi*h) = r^2
Then, finally, we have to square root both sides.
sqrt(V/(pi*h)) = r
So the answer is B.
