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Divide the diameter by 2, this will give you the radius. multiply the radius by the radius, this gives you the radius squared. Multiply the raduis squared by Pi (3.14) to get the circumference.

Formula : Circumfrence = Pi X R squared

so, if the diameter is 10, the radius is 5, the radius squared is 25, 25 X 3.14= circumference

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Q: Connection between the circumference and the diameter of a circle?
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