Geometry

Question Analysis  
This question tests the sequential use of surface area and volume formulas for a sphere.
The main focus is on algebraic manipulation to solve for and then compute .  

Key Concept Explanation  
Surface area provides via .  
Volume is then calculated using in .  

Step-by-Step Solution  
1. Solve for from the surface area:  
   
  Cancel :  
   
  Divide by 4:  
   
  Square root:  
 

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