Solve the equation for the indicated variable.
-$\mathrm{A}=\frac{1}{3} \pi \mathrm{r}^{2}$ for $\mathrm{r}$
A) $r=\frac{3 \pi}{A}$
B) $r= \pm \sqrt{\frac{A}{3 \pi}}$
C) $\mathrm{r}=3 \sqrt{\mathrm{A} \pi}$
D) $r= \pm \sqrt{\frac{3 \mathrm{~A}}{\pi}}$

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The Answer of Solve the equation for the indicated variable.
-$\mathrm{A}=\frac{1}{3} \pi \mathrm{r}^{2}$ for $\mathrm{r}$
A) $r=\frac{3 \pi}{A}$
B) $r= \pm \sqrt{\frac{A}{3 \pi}}$
C) $\mathrm{r}=3 \sqrt{\mathrm{A} \pi}$
D) $r= \pm \sqrt{\frac{3 \mathrm{~A}}{\pi}}$

Solve the Equation for the Indicated Variable A=13πr2\mathrm{A}=\frac{1}{3} \pi \mathrm{r}^{2}A=31​πr2 For r\mathrm{r}r

Solve the Equation for the Indicated Variable $\mathrm{A}=\frac{1}{3} \pi \mathrm{r}^{2}$ For $\mathrm{r}$