Answer:
64
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
the missing length is 14 feet.
Step-by-step explanation:
a = L × W
168ft² = 12 × W     - divide both sides of the equation by 12
                              - 168 ÷ 12 = 14
168ft² = 12 × 14
 
        
             
        
        
        
Since every side of a square is the same length, and the formula to find the area is bh you would just do 2.75²
2.75×2.75=7.5625≈7.56
the answer is the area of the square is approximately 7.56u²