已知半径为
的球的球心
为正四面体
的中心,且球
的球面被四面体
的四个面截得的曲线总长度为
.则四面体
的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dd972b09c87c402de01780f3784424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4986217611fc5eefe70fd217a9d5726a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
更新时间:2018-12-21 07:38:31
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【推荐1】在一个棱长为
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【推荐2】在四面体
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所成的距离之比为
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解题方法
【推荐1】已知正方体
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【推荐2】如图,正方体
的棱长为
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在对角线
上,过点
作垂直于
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,设
,则当
时,函数
的值域为________ .
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