Geometry

Question Analysis
This question involves using the volume formula of a cone to solve for an unknown radius.
The main focus is on rearranging the formula and performing inverse operations correctly while keeping in the calculations.

Key Concept Explanation
Given , we can solve for when and are known.
First, we multiply both sides of the equation by to get , then divide both sides by to isolate , and finally take the square root of both sides to find .

Step - by - Step Solution
1. Start with the volume formula .
Given and , substitute these values: