如图,在空间直角坐标系中有单位正方体
,点E,F分别是
和
的中点,求直线AC与平面ABEF所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
21-22高二·全国·课后作业 查看更多[3]
(已下线)4.3 用向量方法研究立体几何中的度量关系北师大版(2019)选择性必修第一册课本习题第三章4.3用向量方法研究立体几何中的度量关系北师大版(2019)选择性必修第一册课本例题4.3 用向量方法研究立体几何中的度量关系
更新时间:2022-03-07 23:57:47
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【知识点】 线面角的向量求法
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解答题-证明题
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【推荐1】已知四边形ABCD是边长为2的正方形,△P'AB为等边三角形(如图1所示),△P'AB沿着AB折起到△PAB的位置,且使平面PAB⊥平面ABCD,M是棱AD的中点(如图2所示).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/45ce62ba-eef5-48b5-8629-dc99c27fbbaf.png?resizew=346)
(1)求证:PC⊥BM;
(2)求直线PC与平面PBM所成角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/45ce62ba-eef5-48b5-8629-dc99c27fbbaf.png?resizew=346)
(1)求证:PC⊥BM;
(2)求直线PC与平面PBM所成角的余弦值.
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解题方法
【推荐2】如图所示,直三棱柱
中,
,点M在线段
上,
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39769bbb2e539fc42cc25e9e10f34a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e363082228a653eb5b0dbc3c6161a9c9.png)
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解答题-问答题
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【推荐3】如图,在直三棱柱
中,
,
,点
为
的中点,点
在棱
上,
.
![](https://img.xkw.com/dksih/QBM/2021/12/8/2868206079877120/2873105210261504/STEM/2aab6ef52ae54adc88343e199aaf9acb.png?resizew=165)
(1)证明:
平面
;
(2)若
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86c57c1b50bdc9378ef61bde75fdc26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c810d9d154dbbc0cef6ab8ffcd488045.png)
![](https://img.xkw.com/dksih/QBM/2021/12/8/2868206079877120/2873105210261504/STEM/2aab6ef52ae54adc88343e199aaf9acb.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
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