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The circumference of a circle is calculated using the following formula:

c = 2 π r


where:

c is the circumference

r is the radius

π is the constant of pi (3.14159....)


Since the radius is equal to half of the diameter, this formula can also be written as:


c = π d


Or, alternatively:


d = c / π

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More answers

It is pi, an irrational (transcendental) number which is approximately equal to 3.14159

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9y ago
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Q: What is the ratio of the circumference and diameter of any circle?
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