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You need to multiply the diameter by C = Pi x diameter

For your particular query, of a 4-inch diameter circle, it is approximately 12.56 (using pi as 3.14) for the circumference, or distance around the circle. Using a more precise value for pi, it is closer to 12.57 (12.566).

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12y ago

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Q: What is the circumference of a circle with a diameter of 4?
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