Answer:
A constant is a number that stays the same. A variable is number that doesn't remain the same.
 
        
                    
             
        
        
        
a = length of one side.
Area of a square = a^2
in our problem,
Area = 169 square inches
a = ?
Plug our numbers into the area formula mentioned above.
169 in^2 = a^2. 
Take the square root of each side to find the side length of the square shaped platter.
13 = a
 
        
             
        
        
        
648.566 Km is the answer. :)
 
        
             
        
        
        
U.s marine core semper fi