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what is circumference? |
The circumference of a circle is the length around it. The circumference of a circle can be calculated from its diameter using the formula: Or, substituting the radius for the diameter:
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where r is the radius and d is the diameter of the circle, and the Greek letter ? is defined as the ratio of the circumference of the circle to its diameter. The numerical value of ? is 3.141 592 653 589 793....
