The radius, $r$, of a sphere can be found using the formula $r=\sqrt{\frac{S}{4 \pi}}$, where $S$ is the surface area. If the surface area is 15,253 square inches, what is the radius? (Use 3.14 for $\pi$, and round your answer to the nearest tenth of an inch.)
A) 34.8 in.
B) $69.6 \mathrm{in}$.
C) $61.8 \mathrm{in.}$
D) $109.4 \mathrm{in}$.

Question

Quizplus · Accepted Answer

First, substitute $S = 15253$ and $\pi = 3.14$ into the formula $r=\sqrt{\frac{S}{4 \pi}}$, which gives $r = \sqrt{\frac{15253}{4 \times 3.14}}$. Calculating this gives $r \approx 34.8$ inches.

The Radius rrr , of a Sphere Can Be Found Using the Formula

The Radius $r$ , of a Sphere Can Be Found Using the Formula