1. ## rearrange equation

G= pi x D^2/ 4JL

Hi how can I rearrange this to give me a value of D??

2. $G=\left (\frac{\pi x}{4JL} \right )D^2$
$D^2=\frac{G}{\frac{\pi x}{4JL}}$
$D^2=\frac{G4JL}{\pi x}$
$D=$ $+\sqrt{\frac{G4JL}{\pi x}}$ or $-\sqrt{\frac{G4JL}{\pi x}}$