檢視弧长的原始碼

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名称：弧长

定义：在圆上过2点的一段弧的长度叫做弧长

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曲线的'''弧长'''也称曲线的长度，是曲线的特征之一。不是所有的曲线都能定义[[长度]]，能够定义长度的曲线称为可求长曲线。

最早研究的[[曲线]]弧长是圆弧的长度，所以狭义上，特指圆弧的长度。

半径为R的圆中，n°的[[圆心角]]所对圆弧的弧长为nπR/180°，<ref>[https://wenda.so.com/q/1534113479217642 弧长怎么算],360问答 , 2017年11月25日 </ref>