Answer:x= 14
Step-by-step explanation:
84
 
        
             
        
        
        
A^2 + b^2 = c^2 
9^2 + 12^2 = 225 
square root of 225 is 15
        
             
        
        
        
Answer:
 39 inches.
858 inches²
Step-by-step explanation:
Length:- (if length = x)
2 ( 11 + x ) = 100
22 + 2x = 100 
2x = 100 - 22
2x = 78 
x = 78 ÷ 2 
x = 39 inches
Area:-
Area = l × b
= 39 × 22
= 858 inches²