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Diameter = 12 inches, Circumference = 12*(pi) = approx. 37.699

Radius = 12 inches, Circumference = 2*12*(pi) = 24*(pi) = approx. 75.398 inches

If the author has actually measured the outside of the circle (i.e. the perimeter of a dinner plate), that is the circumference! Problem solved.

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15y ago
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Q: What is the circumference of a 12 inch round circle?
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