如图,四棱锥
的底面ABCD为直角梯形,
平面ABCD,
,
,
,
,求平面SAB与平面SCD所成二面角的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9723a6e093c297b001436e8932b1820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650e0f3328b0dd84b4bfbfe388c3e632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffbcd82b98a9ae69aa4ee28bb49a907.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】 面面角的向量求法
相似题推荐
解答题-证明题
|
适中
(0.65)
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【推荐1】如图,四棱锥
,
,
,
,
为等边三角形,平面
平面
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/3e297d5d-59ab-4e40-8391-1ad89f0091b2.png?resizew=177)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec2d5ab801f2a84b78139b0ea2c5032b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/3e297d5d-59ab-4e40-8391-1ad89f0091b2.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ddcfd8985d6ef923063a301e2bc5ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
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解题方法
【推荐2】如图,
,且AD=2BC,AD⊥CD,
且EG=AD,
且CD=2FG,DG⊥平面ABCD,DA=DC=DG=2.
平面CDE;
(2)求平面EBC和平面BCF所夹角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc143c7fd7c471ca91b6ccc22438fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee573ad62dc536a05dadf5008f1afb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求平面EBC和平面BCF所夹角的正弦值;
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解答题-问答题
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【推荐3】如图,在三棱柱
中,
,
,平面
平面
.
(1)求证:
;
(2)若
,三棱锥
的体积为18,点
在棱
上,且
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b974ad626070408fc3be09975a47a1c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5e4b7d5f72a2a44e0833155f4854f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/205fa143-5d5a-486b-a138-496f1bc05253.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003a97711c5ed89f10594e0aedcabfa8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da68b4beefade8076bea97d01c0251fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc578cdb83e89405fb12052e5d503e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b43d280eca53ee6a3661bebb6d23a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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