freeCodeCamp/guide/chinese/mathematics/circle/index.md

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---
title: Circle
localeTitle: 圈
---
## 圈
圆是封闭的形状,其中所有点与中心的距离相同。
从一个点到中心的距离称为半径R
从一个点到中心到另一个点的距离称为直径D
圆周围的距离称为圆周C
![circle](https://upload.wikimedia.org/wikipedia/commons/thumb/0/03/Circle-withsegments.svg/612px-Circle-withsegments.svg.png "圈")
#### 更多信息:
有关插图的更多信息请访问https//en.wikipedia.org/wiki/Circle