已知三棱柱
的侧棱垂直于底面,
,E、F分别是棱
、BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/a9792f16-cb86-491a-b3f3-cecd3bf2a4c1.png?resizew=184)
(1)求证:
平面AEF;
(2)求二面角
的大小;
(3)求点F到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e078697b0951378465a85ed8083592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b77a03d567bafae72d7b14e69bace81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/a9792f16-cb86-491a-b3f3-cecd3bf2a4c1.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c117069912c61e8f6eb6a687597547.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc8be1c529e195dc791f65eec9ec2b8.png)
(3)求点F到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a246e1cbc84b392ab81f70c74b23c28e.png)
更新时间:2021-10-29 16:05:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,
底面
,且
,
,
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/310e95f6-4444-419a-acc3-0a7fdd6c6c44.png?resizew=163)
(1)求证:平面
平面
;
(2)求二面角
的平面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e33a849c6276adc188d414b048665f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f19185a112972b6e6d8b128e49bfdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022365ed188bd800e0b8a2b4ec1e2303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9723a6e093c297b001436e8932b1820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/310e95f6-4444-419a-acc3-0a7fdd6c6c44.png?resizew=163)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68bd91703720951780be6110c83860c.png)
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解答题-证明题
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适中
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【推荐2】如图所示,正三棱柱
的底面边长是2,侧棱长是
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/03afd2db-f439-43f1-b76b-5286f5bb920b.png?resizew=191)
(Ⅰ)求证:
平面
;
(Ⅱ)在线段
上是否存在一点
,使得平面
平面
?若存在,求出
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/03afd2db-f439-43f1-b76b-5286f5bb920b.png?resizew=191)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(Ⅱ)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0410458ba8ffd77471dd645582ab3ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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名校
解题方法
【推荐1】如图①,已知等边三角形ABC的边长为3,点M,N分别是边AB,AC上的点,且
.如图②,将
沿MN折起到
的位置.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988381288013824/2990119940464640/STEM/f7ba61e4-ab74-4bd0-a8fa-f9f08b38d4dc.png?resizew=447)
(1)求证:平面
平面BCNM;
(2)若二面角
的大小为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9ff271330140206b04c4a92617fde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e7040c2fd8a163d71e35805775feb8.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988381288013824/2990119940464640/STEM/f7ba61e4-ab74-4bd0-a8fa-f9f08b38d4dc.png?resizew=447)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca178574ce663e423e3ea16b40ee1fb6.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca78edfd819b3b675455e9f7897f0d4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35247dcbb6b93e8338e53b7b402fe99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9b83d5f52042846158fa921d7e1d3e.png)
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解答题-证明题
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【推荐2】如图,在三棱锥PABQ中,PB⊥平面ABQ,BA=BP=BQ,D,C,E,F分别是AQ,BQ,AP,BP的中点,AQ=2BD,PD与EQ交于点G,PC与FQ交于点H,连接GH.
![](https://img.xkw.com/dksih/QBM/2020/10/1/2561784246796288/2561895053369344/STEM/7a574af50d5d4efeacac7c7cb2e95e72.png?resizew=150)
(1)求证:AB∥GH;
(2)求二面角DGHE的余弦值.
![](https://img.xkw.com/dksih/QBM/2020/10/1/2561784246796288/2561895053369344/STEM/7a574af50d5d4efeacac7c7cb2e95e72.png?resizew=150)
(1)求证:AB∥GH;
(2)求二面角DGHE的余弦值.
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【推荐3】如图,在直三棱柱
中,
,D、E、F分别是棱
、
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/a7465249-ec66-41af-977d-bbca1c736f25.png?resizew=139)
(1)求证:DF
平面
;
(2)若
,求平面DEF与平面ABC的夹角的余弦值.
![](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/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/2023/2/14/a7465249-ec66-41af-977d-bbca1c736f25.png?resizew=139)
(1)求证:DF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7077d7e5ceacb3cd5d7338a8da069c.png)
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【推荐1】如图,在四棱锥
中,
底面ABCD,
,
,
,
,E为PD的中点,F在线段PC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/37caaeb3-2d7e-4b18-aeac-6973fac607ee.png?resizew=191)
(1)求证:
平面PCD;
(2)求CB与平面AEF所成角
的正弦值.
(3)求点C到平面AEF的距离.
![](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/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59b318eb096c1effa251d0ae6212ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f501d3913a937f93c66620ff4aad846e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/37caaeb3-2d7e-4b18-aeac-6973fac607ee.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
(2)求CB与平面AEF所成角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(3)求点C到平面AEF的距离.
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适中
(0.65)
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解题方法
【推荐2】如图,正方体
的棱长为
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/9da997d3-d3b8-4ec3-a872-ec3f1bc472b5.png?resizew=168)
(1)求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/9da997d3-d3b8-4ec3-a872-ec3f1bc472b5.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55d1e3e3d987427a9c9da7b6d01f204.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59375dfae3a8ec264204cfe78caac97d.png)
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