正方体
的棱上到直线
与
的距离相等的点有4个,其中3个点分别为
,
,
,如图所示,则直线
与平面
所成角的正弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378daab67e7e1d1542e6e25f0f259185.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/3001bf77-0b52-4c22-b8b1-8ff3d3355a1c.png?resizew=194)
更新时间:2023-01-04 18:57:58
|
【知识点】 线面角的向量求法
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解题方法
【推荐1】如图,在等腰梯形
中,
,
,过点
作
交
于点
,
,现将
沿
折起,使平面
平面
,连接
、
,则直线
与平面
所成角的正弦值为____________ ;当
时,则二面角
的余弦值为__________ .
![](https://img.xkw.com/dksih/QBM/2021/9/24/2815006784061440/2816601593061376/STEM/5e947bb5f4304c73a90a989e530c633b.png?resizew=206)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a833eb36d4b3ab4769d8d9b65d0755d.png)
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适中
(0.65)
名校
解题方法
【推荐2】正四棱柱
中,
,则
与平面
所成角的正弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72545bef56c4e32d1b76489bd32c3842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10edf318a1cfbffd0fef9dea972a2ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e3ece4dce20324f55badd3d9225e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc0eb47660eea9cb2256de0440d47e0.png)
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