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The circumference of a circle (the distance around the perimeter) is calculated by mulitplying a constant value called Pi (which equals 3.14 and is true for all circles), times the circle's diameter (distance across the center).

Therefore, to answer your question, C = Pi x D, or 3.14 x 20in, or 62.8 inches.

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Q: If a circles diameter is 20in what is the circumference?
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