1 ,3, 1
The first one is 1 the second is 3 and the last one is 1 
 
        
             
        
        
        
im not for sure but I think the answer is 9! my reasoning is below,, 
Step-by-step explanation:

do the crossing method and it would result in this 
(49×x) = (63×7)
after simplifying both sides 
49x = 441 
divide both sides by 49 and the result will be 
x = 9 !! 
 
        
             
        
        
        
Answer:
The three sides have the same length.
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
7.61577310586
Step-by-step explanation:
Pythagoras Theorem 7 squared + 3 squared= 49+9=58
