如图,四边形
为菱形,点
在以点
为圆心的
上,若
cm,
,
则
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e124a392dc84fcc1662fe6d896aa12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e124a392dc84fcc1662fe6d896aa12.png)
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879542132170752/1880908852150272/STEM/17208f1fad3e4d6e8d967431c7496bdd.png?resizew=175)
更新时间:2018-02-18 16:40:13
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【推荐2】如图,已知半⊙O的直径AB=8,将半⊙O绕A点逆时针旋转,使点B落在点B'处,AB'与半⊙O交于点C,若图中阴影部分的面积是8π,则弧BC的长为_____ .
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