已知扇形的弧长和半径,求弦长,怎么计算?
人气：168 ℃ 时间：2019-12-13 11:09:02
解答
设弧长为C,半径为R,弦长为L,圆心角为A
则A=C/R【弧度】
L=2Rsin（A/2）
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