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In geometry, circumference is the distance around a closed curve; for example, a circle. It is a special kind of perimeter. The length of the circumference of a circle is often written as [math]C[/math], with:
- [math]C= \pi d[/math]
where d is the diameter of the circle.
- "List of Geometry and Trigonometry Symbols" (in en-US). 2020-04-17. https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/.
- Weisstein, Eric W.. "Circle" (in en). https://mathworld.wolfram.com/Circle.html.
- "Radius, diameter, & circumference | Circles (article)" (in en). https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-area-circumference/a/radius-diameter-circumference.