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How to draw a figure with a circumference of 25 Li meters in mathematics in the third grade of primary school
25 cm = 250 mm

250 ÷ 2 = 125mm。 The sum of long widening is 125mm.

125mm =100mm+25mm = 90mm+35mm = .........

Now as long as the sum of the two quantities is equal to 125mm, it can be regarded as the length and width, and the corresponding rectangle can be drawn. The circumference of such a rectangle must be equal to 25 cm.