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The radius of the big circle is twice that of the small circle, the circumference of the big circle is 25.12cm, and the circumference of the small circle is () cm
25.12 / 3.14 = 8 diameter of big circle
Because the radius of the big circle is twice that of the small circle, the diameter of the big circle is twice that of the small circle
8 / 2 = 4 small circle diameter
4 * 3.14 = 12.56 small circumference
Or just divide the circumference of the circle by two
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