Question

Make r the subject of the formula: V=pier^2h

Answer 1

V = πr²h
Divide by h
V/h = πr²
Divide by π
V/πh = r²
Square Root
√(V/πh) = r
r = √(V/πh)

Answer 2

If you mean π. Then, all that will be ;
V=πr²h
First of all, you have to divide the both the sides by πh. You have to do this because the relationship between r and those two characters is multiplication. The opposite of multiplication is division. Anyway;
V/πh=πr²h/πh
V/πh=r²
Next you have to take the square root of both sides. This is done to cancel the square. Anyway;
√V/πh=√r²
The square root cancels the ². Anyway, you will be left with;
√V/πh=r
So;
r=√V/πh.
Hope i helped. Have a nice day.