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To find the circumference of the nickel, you can use the formula C=πd. Where C is the circumference and d is the diameter. π is a special constant with a value approximately equal to 3.14. Substituting your numbers into the equation gives you C≈3.14(21) or C=65.94 square mm.

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Q: If the diameter of a nickel is 21 millimeters what is the circumference?
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