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The circumference is 2 * pi times the radius, or c = 2 * pi * r. The diameter is twice the radius, so c = pi * d, where d is the diameter.

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Q: What is circumference of a circle with a diameter of 9?
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If the diameter of a circle is 9 what is the circumference?

If the diameter of a circle is 9 the circumference is: 28.3


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If a circle has a diameter of 9 what is the circumference?

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What is the circumference of a circle with a diameter of 9?

28.27 units.