圆
为锐角
的外接圆,
,则
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e83ac5efc4c142c43c5e7a3e156c407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f3c7b80dc69306d6b87f6383ef5a458.png)
更新时间:2023-03-31 14:47:36
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【推荐1】设O是直线
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【推荐2】在
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【推荐1】在
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(2)
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【推荐1】折扇又名“撒扇”“纸扇”,是一种用竹木或象牙做扇骨,韧纸或绫绢做扇面的能折叠的扇子,如图1.其平面图如图2的扇形
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解题方法
【推荐2】“圆幂定理”是平面几何中关于圆的一个重要定理,它包含三个结论,其中一个是相交弦定理:圆内的两条相交弦,被交点分成的两条线段长的积相等.如图,已知圆
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②
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③当
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③当
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【推荐3】如图,在
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