A circumference is the distance around a circle. To find a circle's circumference you need to follow the formula: d*pi
The d stands for diameter and pi is 3.14. You need to mulitply the length of the diameter by pi for the circumference. Or, if the diameter isn't given, multiply the radius by 2 and then multiply that by pi.
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Circumference = 17*pi
What is the circumference of a circle 3ft
Divide the diameter by 2.
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If 20 is the diameter, the circumference is 62.8 yards.