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弧长的公式
更新时间: 2021-05-17 04:14:06  

1、弧长公式

2、l = n(圆心角)× π(圆周率)× r(半径)/180=α(圆心角弧度数)× r(半径)

3、在半径是R的圆中,因为360°的圆心角所对的弧长就等于圆周长C=2πr,所以n°圆心角所对的弧长为l=n°πr÷180°(l=n°x2πr/360°)

4、例:半径为1cm,45°的圆心角所对的弧长为

l=nπr/180

=45×π×1/180

=45×3.14×1/180

约等于0.785

关键词: 公式

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