Circumference
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]\displaystyle{ C }[/math],[1] with:[2][3]
- [math]\displaystyle{ C= \pi d }[/math]
where d is the diameter of the circle.
Circumference Media
circumference C*diameter D*radius R*center or origin OCircumference = π × diameter = 2π × radius.
When a circle's diameter is 1, its circumference is \pi.
When a circle's radius is 1—called a unit circle—its circumference is 2\pi.
Related pages
References
- ↑ List of Geometry and Trigonometry Symbols (in en-US). Math Vault (2020-04-17). Retrieved 2020-09-24.
- ↑ Weisstein, Eric W.. Circle (in en). mathworld.wolfram.com. Retrieved 2020-09-24.
- ↑ Radius, diameter, & circumference | Circles (article) (in en). Khan Academy. Retrieved 2020-09-24.
Other websites
- Numericana - Circumference of an ellipse
- Circumference of a circle With interactive applet and animation