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If 9 cm is the diameter, I think the circumference should be 9 times pi centimeters, which is approximately 28.274333882308139146163790449516 centimeters for the circumference.
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The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.
Thus: 3.14 x 9 = 28.26cm
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