In a square with a side length of 6cm, cut out the largest circle. How much smaller is the area of the circle than that of the square?

6 × 6 = 36 (square centimeter); 6 △ 2 = 3 (centimeter); 3.14 × 32 = 28.26 (square centimeter); (36-28.26) △ 36, = 7.74 △ 36, = 21.5%; answer: the area of circle is 21.5% less than that of square

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