Question

Solve a=2pir^2 2pirh for pi

Answer 1

A = 2$\pi$ $r^{2}$ 2$\pi$rh   |Divide by 4h$r^{3}$

$\pi ^{2}$ = $\frac{a}{4h r^{3} }$          |Square root on both sides

$\pi$ = $\sqrt{ \frac{a}{4h r^{3} } }$