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divide the diameter of 25.6 by 2 to find the radius. The radius is 12.8. The formula to find the circumference is radius squared times pi. 12.8 squared is 163.84 and multiplied by pi is 514.7.. So Circumference = 514.7

The above computation gives the AREA of the circle, not the CIRCUMFERENCE.

The CIRCUMFERENCE is 2 times the radius times pi, or the diameter times pi.

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Q: If the diameter is 25.6 what is the circumference?
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