88 feet
<span>√</span>484=22
Perimeter is l+l+l+l
22+22+22+22=88
        
                    
             
        
        
        
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<span>Compatible </span>numbers for 256...
1. Rounded to the nearest hundred = 200
2. Rounded to the nearest tens place = 260
Compatible numbers for 321...
1. Rounded to the nearest hundred = 300
2. Rounded to the nearest tens place = 320
I hope this helps! :)