Cut the square cardboard with side length of 20cm into four small squares of the same size. How many centimeters is the circumference of each small square

A: 40cm
To cut a square with a side length of 20cm into four small squares of the same size is to divide the big square into four parts. The side length of each small square is half of the big square, that is, 10cm. The perimeter of the small square is 4 * 10 = 40cm

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