如图,在长方体
中,已知
,
,则直线
与平面
所成角的正弦值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7863ef41313423eb2247c0f9e5ad0f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb04914c4e8fb3483da44c67fe1809f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/873e38d4-2284-428e-a8bb-f3e78e79a5f9.png?resizew=216)
更新时间:2020-07-27 10:54:19
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【知识点】 求线面角
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