已知正四面体
的四个顶点都在球心为
的球面上,点
为棱
的中点,
,过点
作球
的截面,则截面面积的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2202d9071a4a53bb61b1237269e537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
更新时间:2017-04-14 16:55:35
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【推荐1】如图,直线
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【推荐2】点M是棱长为2的正方体ABCD﹣A1B1C1D1的棱切球(切于正方体各条棱的球)上的一点,点N是△ACD1的外接圆上一点,则线段MN长度的取值范围是_____ .
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