如图,在正方体
中:
的大小为________ .
(2)二面角
的大小为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8160e59f27f3748014e01d562770eb54.png)
(2)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b929614f6ad667d632381d56a938a899.png)
20-21高一下·全国·课后作业 查看更多[3]
6.5.2平面与平面垂直的性质 课时练习2020-2021学年高一下学期数学北师大版(2019)必修第二册(已下线)第二章 立体几何中的计算 专题一 空间角 微点8 二面角大小的计算综合训练【基础版】(已下线)8.6.3平面与平面垂直——随堂检测
更新时间:2023-04-20 15:05:29
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【知识点】 求二面角
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填空题-单空题
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解题方法
【推荐1】已知
,
为二面角
棱
上不同两点,
,
分别在半平面
,
内,
,
,
,若直线
与
所成角的余弦值为
,则二面角
的大小为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c638fb895acd987140d0ca6bef097499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f270d68b62e1181695a7c817c6fbcaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
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【推荐2】如图所示,将等腰直角△ABC沿斜边BC上的高AD折成一个二面角,此时
,那么这个二面角大小是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5afb5833e44864637b9ec28750ef6dd3.png)
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076985613385728/2079058714345473/STEM/b561985cd6f84e00b1332837d45a7082.png?resizew=122)
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