Geometry

Question Analysis  
This question requires:  
1. Rearranging the volume formula to solve for radius.  
2. Substituting known values (, ).  

Key Concept Explanation  
The volume of a cone is given by the formula:

- Rearranged Formula:  
   (r is non-negative)

Step-by-Step Solution  
1. Start with the volume formula:  
 

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