Solve the formula V = T12h for r.

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.