Question

V=1/2pir^2h
Solve for r

Answer 1

V =
`(1)/(2)`πr²h Multiply both sides by 2
2V = πr²h Divide both sides πh

`(2V)/(\pi h)` = r² Find the square root of both sides

`\sqrt{ (2V)/(\pi h) }` = r Switch the sides to make it easier to read
r =
`\sqrt{ (2V)/(\pi h) }`