Geometry

Question Analysis:  
This question requires rearranging the Pythagorean Theorem to solve for a missing leg.

Key Concept Explanation:  
The Pythagorean Theorem states that in a right triangle:  
 
where and are the legs, and is the hypotenuse.  

Step-by-Step Solution:  
1. Given: , .  
2. Plug into the theorem:  
   
 

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