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Circumference of a circle is equal to 2(pi)r with r being the radius, or (pi)d with d being the diameter. If we use (pi)d, with d being equal to 7 and (pi) being equal to 3.14159, we get that the circumference is 21.9911485751 inches. This can be rounded to 22 inches.

3.14159 * 7in = 21.9911485751in

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Q: What is the circumference of a circle if it's diameter is 7 inches?
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