Circle Circumference
Math CalculatorsCalculate the circumference and diameter of a circle.
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Circumference (C)
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Diameter (d)
About This Tool
Find the distance around a circle given its radius or diameter. This tool uses the mathematical constant Pi (π) for high-precision results.
Frequently Asked Questions
The circumference of a circle is calculated using the formula $C = 2\pi r$ or $C = \pi d$, where $r$ is the radius and $d$ is the diameter.
Pi is a mathematical constant approximately equal to 3.14159. It represents the ratio of any circle's circumference to its diameter.
The diameter of a circle is exactly twice the length of its radius ($d = 2r$). Both are key measurements used to define a circle's size.
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