Use a Calculator to Solve the Equation $\pi$ In
C) 9 In Solve

Multiple Choice

Use a calculator to solve the equation. Round to the nearest hundredth, if necessary.
-The surface area S of a sphere with radius r is given by the formula If a sphere has surface area square inches, what is its radius?

A) 81 in.
B) 9 $\pi$ in.
C) 9 in.
D) 18 in.