2 answers:
            
              
              
                
                
<h3>By using Pythagoras Theorem:-</h3>
(Hypotenuse)² = (Base)²+ (Perpendicular)²
Taking, Hypotenuse As H
Base As B
Perpendicular As P
_________________________
<h3>Solving The Question</h3>
H²= B²+ P²

<h3>Hope This Helps You ❤️</h3>
 
                    
              
              
                
                

Length of missing leg = 12 km
Using Pythagoras theorem 
a² = 15² - 9²
a = √ 225 - 49
a = √144
a = 12 km
HOPE IT HELPS.. 
 
                                
             
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