Answer:
A: they are equal in length to the sides of the base 
Step-by-step explanation:
 
        
                    
             
        
        
        
The absolute value makes it 9
 
        
                    
             
        
        
        
Answer:
What are we trying to figure out with this information??
P.S. I am not collecting the points, I will revise my answer once you fix the question!! :)