The Radius $r$ , of a Right Circular Cone Can Be Found Using

The radius, $r$ , of a right circular cone can be found using the formula $r=\sqrt{\frac{3 V}{\pi h}}$ , where $V$ is the volume and $\mathrm{h}$ is the height. If the volume is 680 cubic inches and the height is 6 inches, what is the radius? (Use 3.14 for $\pi$ , and round your answer to the nearest tenth of an inch.)

A) $10.9 \mathrm{in}$ .
B) $6.0 \mathrm{in}$ .
C) $10.4 \mathrm{in}$ .
D) $5.2 \mathrm{in}$ .