来自黄才发的问题
【若扇形的周长为6，面积为2，则扇形的圆心角的弧度数为______．】
若扇形的周长为6，面积为2，则扇形的圆心角的弧度数为______．
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2020-12-30 04:39
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刘青宝
设扇形的圆心角的弧度数为α，圆的半径为r，则
2r+αr＝612αr
2020-12-30 04:40:34
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