如图,正方形ABCD与正方形ABEF所在平面相交于AB,在对角线AE,BD上各有一点P,Q,且AP=DQ.求证:
平面BCE.(用两种方法证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1a378a3a4660eb1ece52085a9b44d5.png)
![](https://img.xkw.com/dksih/QBM/2022/2/19/2920038491275264/2922039224254464/STEM/d0978593-d49d-4eec-a047-34cc1d692a9f.png?resizew=155)
21-22高一·湖南·课后作业 查看更多[2]
更新时间:2022-02-22 19:26:55
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【知识点】 证明线面平行
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【推荐1】如图,在长方体
中,底面
是边长为2的正方形,
,
分别为
,
的中点. 证明:
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/88208c0c-0948-49c9-9390-5926aee1be2e.png?resizew=150)
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【推荐2】如图,AE⊥平面ABCD,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fd4ce957dc0d1e8740861e8910647f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/b5de14c1-77f3-4dd4-b99a-c71f8ee90b0e.png?resizew=192)
(1)求证:BF∥平面ADE;
(2)求直线CE与平面BDE所成角的正弦值:
(3)求平面BDE与平面BDF夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8062605fdc0cc0216c97391adf9dc930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fd4ce957dc0d1e8740861e8910647f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/b5de14c1-77f3-4dd4-b99a-c71f8ee90b0e.png?resizew=192)
(1)求证:BF∥平面ADE;
(2)求直线CE与平面BDE所成角的正弦值:
(3)求平面BDE与平面BDF夹角的余弦值.
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