When Jaya divided surface area of a sphere by the sphere’s volume, she got the answer as $\dfrac{1}{18}$ cm. What is the radius of the sphere?
24 cm
6 cm
54 cm
4.5 cm
Explanation:
$\dfrac{4 \pi r^2}{\dfrac{4}{3} \pi r^3}$ = $\dfrac{1}{18}$
∴ $\dfrac{3}{r}$ = $\dfrac{1}{18}$
∴ r=54 cm
$\dfrac{4 \pi r^2}{\dfrac{4}{3} \pi r^3}$ = $\dfrac{1}{18}$
∴ $\dfrac{3}{r}$ = $\dfrac{1}{18}$
∴ r=54 cm