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# Circumference

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The English Wiktionary has a dictionary definition (meanings of a word) for:

**circumference**In geometry, circumference is the distance around a closed curve; for example, a circle. It is a special kind of perimeter.(c=PI x diameter)

- [math]c = \pi * diameter[/math]

## Other websites

- Numericana - Circumference of an ellipse
- Circumference of a circle With interactive applet and animationfa:پیرامون یک خم بسته