在正方体
中,平面
与正方体的各个面所成的二面角的大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
更新时间:2023-01-31 16:39:35
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【知识点】 求二面角
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解题方法
【推荐1】如图,四棱锥
中,底面
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,
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(0.85)
解题方法
【推荐2】正方体
的棱长为
,则平面
与平面
所成角为_______ ;设
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的中点,过点
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的平面截该正方体所得截面的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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