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2015-09-14T23:52:32+05:30

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Perimeter of square 1 :  4 * a = 748 cm
    side of square 1:    a = 187cm
     area of square 1:    a² = 187² cm²

Perimeter of square 2:  4 * b  = 336 cm
   side of square 2:    b = 84 cm
   area of square 2:   b² = 84² cm²

Sum of areas of both = 42025 cm²
    size of side of a square with this area = √42025 = 205 cm
      perimeter of this square = 4 * 2015 = 820 cm
       Diagonal of this square = √2 * side = 205 √2 cm

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