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圆形周长公式
更新时间: 2021-01-15 05:07:31  

1、圆的周长:C=2πr=πd(r为半径,d为直径)。

2、圆形一般指圆。在一个平面内,一动点以一定点为中心,以一定长度为距离旋转一周所形成的封闭曲线叫做圆。圆有无数条对称轴。在同一平面内,到定点的距离等于定长的点的集合叫做圆。

关键词: 圆形 周长 公式

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