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The formula for circumference of a circle is pi*d or 2(pi)r

The first is better since we already have the diameter.

To solve this, simply multiply the two

You can leave your answer was 12.6(pi) or make pi equal to 3.14 (not prefered, but ok for beginners)

If you did choose to do this, you would get 39.564

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Q: What is the circumference of a circle with a diameter of 12.6 inches?
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