Question

v=πr^2h
solve for r
r=

Answer 1

To solve for r, you just need to isolate r. To do that, divide by h and π on both sides:
$\frac{V}{h \pi }=r^2$

Then, square root both sides to get rid of the 'squared':
$r = \sqrt{ \frac{V}{h \pi } }$

Or, if you wanted the answer in terms of π, then just don't divide by it, just divide by h and then square root it.

Answer 2

$r=$ $\sqrt{ \frac{V}{ \pi h} }$