如图,多面体
中,
两两垂直,且
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/27813c07-76d2-4cab-8733-337fa252e5b0.png?resizew=167)
(1)若点
在线段
上,且
,求证:
面
;
(2)若点
在线段
上,当直线
与平面
所成角的正弦值为
时,求线段
的长;
(3)求锐二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f74fcff24edb5c3c44894023dbfdc78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef0f4f2fa1f55c4d82d11ac48566489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a77f26a7be722e00baa984f769ec8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8fc3ee9005673e5ed0eb7a1b5a5b479.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/27813c07-76d2-4cab-8733-337fa252e5b0.png?resizew=167)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00db9b6ae3f7d52673bd15b516a66cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f220434c51562f59e302899804899954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa00709db52164ca2d290e55b4dbc0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
(3)求锐二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d243d9a135116a6749d586fd5b95ec73.png)
更新时间:2020-10-15 17:36:19
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真题
【推荐1】如图,四边形ABCD是边长为1的正方形,
,
,且MD=NB=1,E为BC的中点
1. 求异面直线NE与AM所成角的余弦值
2. 在线段AN上是否存在点S,使得ES
平面AMN?若存在,求线段AS的长;若不存在,请说明理由
![](https://img.xkw.com/dksih/QBM/2010/3/15/1569633380302848/1569633406836736/STEM/0785b87c4c1244dd911df53455ae7a80.png)
![](https://img.xkw.com/dksih/QBM/2010/3/15/1569633380302848/1569633406836736/STEM/79f663d289894493a6e5f2cc90b2ae10.png)
1. 求异面直线NE与AM所成角的余弦值
2. 在线段AN上是否存在点S,使得ES
![](https://img.xkw.com/dksih/QBM/2010/3/15/1569633380302848/1569633406836736/STEM/6c0e85aa51b8486a9f6be706ef31580d.png)
![](https://img.xkw.com/dksih/QBM/2010/3/15/1569633380302848/1569633406836736/STEM/ab03922d-ed3e-4e20-a33e-45a38ee1d266.png?resizew=236)
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【推荐2】在等腰梯形ABCD中(如图),
,
,
,
,
,现沿DE将等腰梯形折成直二面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/c1f7a906-d758-4145-8341-dcef7ec92f7b.jpg?resizew=165)
(1)证明:
平面ACE;
(2)求平面ADE与平面ABC所成二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/c1f7a906-d758-4145-8341-dcef7ec92f7b.jpg?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
(2)求平面ADE与平面ABC所成二面角的余弦值.
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解题方法
【推荐1】在直角梯形ABCD中,
,
,
,如图①把
沿BD翻折,使得平面
平面
(如图②).
(1)求证:
;
(2)若点M为线段BC的中点,求点M到平面ACD的距离;
(3)在线段BC上是否存在点N,使得AN与平面ACD所成的角为
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbd8599cee48d867a73477d60b1f62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/3/0c4f250a-5c96-408c-a328-5f1449352024.png?resizew=302)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)若点M为线段BC的中点,求点M到平面ACD的距离;
(3)在线段BC上是否存在点N,使得AN与平面ACD所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48732e80ec3c3b6de906d598c69840d5.png)
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【推荐2】如图,在四棱锥
中,
平面ABCD,
,
,E为CD的中点,M在AB上,且
,
(1)求证:
平面PAD;
(2)求平面PAD与平面PBC所成锐二面角的余弦值;
(3)点F是线段PD上异于两端点的任意一点,若满足异面直线EF与AC所成角为
,求AF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3299fc3474a4b67ffc38e5397c9b98d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b684dd5c86b7568976bf92dc02ce729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/e5d3c671-7b37-404d-a398-7c67966640a0.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
(2)求平面PAD与平面PBC所成锐二面角的余弦值;
(3)点F是线段PD上异于两端点的任意一点,若满足异面直线EF与AC所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
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【推荐3】已知四棱锥
,底面
为菱形,
为
上的点,过
的平面分别交
于点
,且
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/6f5e6c6a-36a2-4acb-9fa5-a9a7edee4b52.png?resizew=172)
(1)证明:
;
(2)当
为
的中点,
与平面
所成的角为60°,求平面
与平面
所成锐二面角的大小.
![](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/696ce5422605ffbaedab96bff18840db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930e85bc9f73e86cfb6ce9b076433f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/6f5e6c6a-36a2-4acb-9fa5-a9a7edee4b52.png?resizew=172)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee7e751649a571354de70a59c0d8d0c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71cd821556abe4b0bd3318aa07e3d05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
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解题方法
【推荐1】如图,在棱长均为2的四棱柱
中,点
是
的中点,
交平面
于点
.
为线段
的中点;
(2)再从条件①、条件②、条件③这三个条件中选择两个作为已知,使得四棱柱
存在且唯一确定.
(i)求二面角
的余弦值;
(ii)求点
到平面
的距离.
条件①:
平面
;
条件②:四边形
是正方形;
条件③:平面
平面
.
注:如果选择的条件不符合要求,则第2问得0分;如果选择多组符合要求的条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)再从条件①、条件②、条件③这三个条件中选择两个作为已知,使得四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(i)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a150b9250addf8b5dbbf8a89c61c5d.png)
(ii)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e11d3af986880db2910a92e26e0b5b.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddbb0422a136f45653c8c369f2d75fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件②:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
条件③:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a45953045e613b97eeee15ac188ae2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c52091eb745de866044477641a7c55f.png)
注:如果选择的条件不符合要求,则第2问得0分;如果选择多组符合要求的条件分别解答,按第一个解答计分.
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【推荐2】如图,三棱锥
中,
,底面
为正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/29df18d5-a09e-41c7-82bc-f3a37e801c0c.png?resizew=173)
(1)证明:
;
(2)若平面
平面
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/29df18d5-a09e-41c7-82bc-f3a37e801c0c.png?resizew=173)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8352d5c45ab39423140d9d2db6ad192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
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【推荐3】已知四棱锥
中,
,
,
,
,M为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/ed08871d-580c-4457-95a9-58d2836ef262.png?resizew=158)
(1)求证:
平面
;
(2)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d38cc7012c328f1f22aa793fe76d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/ed08871d-580c-4457-95a9-58d2836ef262.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1016bb201c2261d0f9774e85d2eefa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698335f4880c7a298f4898c83b6562bf.png)
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