The side of a cylinder is expanded to be a square with a side length of 12.56 cm. The diameter of the bottom of the cylinder is______ Cm
If the side length of the square = the perimeter of the bottom = 12.56 cm, then the diameter of the bottom = 12.56 △ 3.14 = 4 (CM); answer: the diameter of the bottom of the cylinder is 4 cm
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