Hi

Area of square = s^2, where s is the length of each side

  s^2 = 484

   s = 22cm  (tossing out negative solution for length)

Applying the Pythagorean Theorem

 (22cm)^2 + (22cm)^2 = d^2

     968cm^2 = d^2

   d = 31.1127cm  

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