To calculate the circumference of a circle use the formula c d where c is the circumference d is the diameter and is 314 if you have the radius instead of the diameter multiply it by 2 to get the diameter you can also use the formula for circumference of a circle using radius which is c 2r. How to calculate diameter from circumference write down the formula for calculating the circumference of a circle c d where c circumference 314 and d diameter say aloud the meaning of the formulas symbols to make sure you understand saying circumference equals pi times the diameter of a circle . The following circumference calculator is easy to use just enter the value of the radius and hit calculate button recall that the formula to get the circumference of a circle is 2 pir with pi 3141592653589793 therefore the circumference depends only on the size of r that is why you only need to enter r here to get the circumference
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