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扇形周长公式

更新时间: 2021-05-17 00:57:00     

1、因为扇形=两条半径+弧长,若半径为R,扇形所对的圆心角为n°,那么扇形周长:C=2R+nπR÷180。

2、在半径为R的圆中,因为360°的圆心角所对的扇形的面积就是圆面积S=πR^2,所以圆心角为n°的扇形面积:S=nπR^2÷360。

关键词: 扇形 周长 公式

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