如图,在多面体ABCDE中,平面
平面ACDE,四边形ACDE是等腰梯形,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7d3176805199391d9a1c47fe4d20b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/a3516448-645e-48a0-9e73-418f1e7e545d.png?resizew=174)
(1)若
,求BD与平面ACDE所成角的正弦值;
(2)若平面BDE与平面BCD的夹角为
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4025b7c8380b8aeb5a31a5e14eafa98b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7d3176805199391d9a1c47fe4d20b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/a3516448-645e-48a0-9e73-418f1e7e545d.png?resizew=174)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
(2)若平面BDE与平面BCD的夹角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
更新时间:2023-01-11 19:12:47
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相似题推荐
解答题-问答题
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【推荐1】如图,四棱锥
中,底面
为直角梯形,
,
,
平面
,
,
、
分别为
与
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/46c9ea9c-8dd4-4f68-9c46-29fb7ad034f2.png?resizew=190)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536a2be7b84612f45cc875a00c5a5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b879e4b8a2e0dc40fdd94932ea8e9bb6.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/46c9ea9c-8dd4-4f68-9c46-29fb7ad034f2.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐2】如图,在三棱锥
中,
为正三角形,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/28127681-d04b-4d6c-bf58-2852053953be.png?resizew=168)
(1)求证:
;
(2)若
是
的中点,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9c515dc5337d5ed8afe3f81b68c57a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/28127681-d04b-4d6c-bf58-2852053953be.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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【推荐3】如图,在直棱柱
中,
,
,D,E,F分别是
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/c5e4e7b8-5d4f-4fa3-8bf9-675045f1e0e6.png?resizew=165)
(1)求证:
;
(2)求
与平面DEF所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002c709e9fee8d477bddfe595cc760f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8bd8c13192ca45c16dad5d59b547220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/c5e4e7b8-5d4f-4fa3-8bf9-675045f1e0e6.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fe81d0b136fc2acc97ab50ffbf6edf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-问答题
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【推荐1】如图,在四棱锥
中,平面
平面
,点
在棱
上,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/08ea6e3d-5edb-4888-9349-fc96900c9eab.png?resizew=186)
(1)证明:
.
(2)设二面角
的平面角为
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9772edb4ec7db3eab5e2bd00936ee21a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6822db67464507ee6997b93103003a36.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/08ea6e3d-5edb-4888-9349-fc96900c9eab.png?resizew=186)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
(2)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbeab80976db9b4689b9446cda06196a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7f904c086a749da7b7f8e26213a3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
【推荐2】如图,在直三棱柱
中,
,
,
为
的中点.
平面
;
(2)若二面角
的余弦值为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d331850e91390d587ccddcb892f977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.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/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821309f088a175c00dc0f4828334503d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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【推荐3】在四棱锥
中,底面ABCD为直角梯形,
,
,
,平面
平面ABCD,
,E为PA中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/270c273f-f596-4647-ae44-7e89ab0f26df.png?resizew=186)
(1)求证:
平面PBC;
(2)已知平面PAD与平面PBC的交线为l,在l上是否存在点N,使二面角
的余弦值为
?若存在,请求出PN的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e70d5be99ab8b058ff2fb4d8c3d0d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca15fe5faca08d49a0382bc1941a497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2c4cc37d6ba218107c9c5d820740fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a336b440498d8480309d275946a8a01d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/270c273f-f596-4647-ae44-7e89ab0f26df.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ceccc2be66a348793f6f2ab018beb4a.png)
(2)已知平面PAD与平面PBC的交线为l,在l上是否存在点N,使二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243d4a25480a8ad75d1c7bdda3e25568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1dd362f843e640ce551ad1787c9873.png)
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