1 . 如图(1)所示,在等腰直角三角形
中,
,
,
分别为
,
的中点,将
沿
折起,使A到达
(如图2)且满足
,M是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f2915a14-ab79-44d0-bbe0-5eba975aaa7d.png?resizew=300)
(1)求证:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa40b456747f69437444833aab387be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f2915a14-ab79-44d0-bbe0-5eba975aaa7d.png?resizew=300)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6dfed58659a9cab4d1836c3d2effdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9c7940d6f1ede201fd27d5d9e0650d.png)
您最近一年使用:0次
名校
2 . 如图,在四棱锥
中,
平面
,底面
是直角梯形,其中
,
,
,
,E为棱
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/539de07f-0b4b-4cc1-9bcd-10da86d0f8a4.png?resizew=154)
(1)若F为棱
的中点,求证:
平面
;
(2)(i)求证
平面
;
(ii)设Q为棱
上的点(不与C,P重合),且直线
与平面
所成角的正弦值为
,求
的值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abfb2735e1683a6ae86b5b97a0032e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41744ec71119e7264ef9673a35805a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/539de07f-0b4b-4cc1-9bcd-10da86d0f8a4.png?resizew=154)
(1)若F为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)(i)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(ii)设Q为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2942447b6af4f2749668439d5ee03a7.png)
您最近一年使用:0次
2021-04-11更新
|
1099次组卷
|
4卷引用:天津市耀华中学2022届高三暑假线上调研数学试题
天津市耀华中学2022届高三暑假线上调研数学试题北京市清华大学附属中学2020-2021学年高二上学期期末考试数学试题(已下线)专题02 空间向量与立体几何的典型题(二)-【尖子生专用】2021-2022学年高二数学考点培优训练(人教A版2019选择性必修第一册)(已下线)一轮复习大题专练50—立体几何(线面角2)—2022届高三数学一轮复习
3 . 如图,在四棱锥
中,
,
,
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/26750074-42fe-4109-8b32-540e4d1fe159.png?resizew=183)
(1)求证:
;
(2)若
,
,求直线
与平面
所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f90126f831d6600522ecaa66c2a8b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32dbe79c450f9667964763ac0c962a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b212ff4649b37b655010ef687a5f4fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/26750074-42fe-4109-8b32-540e4d1fe159.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
解题方法
4 . 如图①,
中,
,D为AB中点.沿CD将
折起,折起后的A点记为E(如图②).
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722577328586752/2723526337159168/STEM/dc1e73ff-ac87-4412-8765-1c3fb6940620.png)
(1)求证:平面
平面EBD;
(2)若
,线段CE上是否存在一点F,使得二面角
的余弦值为
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca33bd14fffd3ccaa6e9af1b9d64758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/17/2722577328586752/2723526337159168/STEM/dc1e73ff-ac87-4412-8765-1c3fb6940620.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7fb4bb4caccf79639a126064771da5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2030b5dba98130cd9bd0e68f5a668e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f637bf133818d36ad04ce78d3a6cc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616d7ecae21a9a0b803d0b56724455ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c396ff7b55ccd59f5d5e184abd1d99b.png)
您最近一年使用:0次
名校
5 . 如图,在四棱锥
中,O是
边的中点,
底面
.在底面
中,
.
![](https://img.xkw.com/dksih/QBM/2021/3/29/2688477742915584/2688501080498176/STEM/aaf041cc-5b82-46b7-9504-42d35e45a0cc.png)
(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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b114d2cfa825d1340daa80b5a5df0e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9e6c5ff493be5e6b3fed95689ae54b.png)
![](https://img.xkw.com/dksih/QBM/2021/3/29/2688477742915584/2688501080498176/STEM/aaf041cc-5b82-46b7-9504-42d35e45a0cc.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307807ee10071bafbe922eb18d2517d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e657a4a33ed01c3a2807218100efbef.png)
您最近一年使用:0次
2021-03-29更新
|
1632次组卷
|
9卷引用:北京市朝阳区2021届高三一模数学试题
名校
6 . 在三棱柱
中,
侧面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/e62834bb-8cca-437f-837e-39ca85127a17.png?resizew=206)
(1)求证:
;
(2)若E为棱
的中点,且
与平面
所成角的正弦值为
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec738fd1916032dff2b93f84f039404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8cb98c0adee7ca698d8b17dacb845b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/e62834bb-8cca-437f-837e-39ca85127a17.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429228f882da65a8e0064c88d02b8e40.png)
(2)若E为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80445f463fa0bdc97c0ba062d03ce342.png)
您最近一年使用:0次
2021-02-06更新
|
571次组卷
|
3卷引用:山西省阳泉市2021届高三三模数学(理)试题
7 . 在四棱锥
中,
平面ABCD,底面ABCD是直角梯形,其中
,
,
,E为BC的中点,设Q为PC上一点.
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650780840394752/2652045375299584/STEM/0ca3fcdfbcdb4285871ebf76e559381f.png?resizew=203)
(1)求证:
;
(2)若直线EQ与平面PAC所成的角的正切值为
,求二面角
的余弦值.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e803c7a0cfb59786ff6724a97e41d60.png)
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650780840394752/2652045375299584/STEM/0ca3fcdfbcdb4285871ebf76e559381f.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3672e603d06c9186edd20cfc662d8dc.png)
(2)若直线EQ与平面PAC所成的角的正切值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7e0c2c5b4a05322423f70814a65645.png)
您最近一年使用:0次
2021高三·全国·专题练习
名校
8 . 如图,矩形ABCD中,AB=2,BC=1,E为CD的中点.把△ADE沿AE翻折,使得平面ADE⊥平面ABCE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/9453ba49-1ccf-4e76-8d07-ecc4bbca672c.png?resizew=373)
(1)求证:AD⊥BE;
(2)求BD所在直线与平面DEC所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/9453ba49-1ccf-4e76-8d07-ecc4bbca672c.png?resizew=373)
(1)求证:AD⊥BE;
(2)求BD所在直线与平面DEC所成角的正弦值.
您最近一年使用:0次
名校
9 . 如图,已知四棱锥
,
是等边三角形,
,
,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f1836a27-7e3a-4c92-9a07-b686f67a093d.png?resizew=152)
(1)求证:直线
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/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ae5f8381ffcce4281a0ca817b82a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/f1836a27-7e3a-4c92-9a07-b686f67a093d.png?resizew=152)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2021-03-28更新
|
479次组卷
|
3卷引用:甘肃省兰州市永登县第一中学2020-2021学年高三上学期期末数学试题
名校
10 . 如图,四棱锥
的底面
是等腰梯形,
,
,
.
是等边三角形,平面
平面
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/d78ae589-3195-40e6-b7e0-2e05ca22afd2.png?resizew=182)
(1)当
为棱
中点时,求证:
;
(2)是否存在点
使得二面角
的余弦值为
,若存在,求
的长;若不存在,请说明理由.
![](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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e921f46d90e43f4517c55832b6280f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f409b28f7cb97726646e79709ad25190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/d78ae589-3195-40e6-b7e0-2e05ca22afd2.png?resizew=182)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a4c525f97e2c55660669fa87896368.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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4卷引用:黑龙江省漠河市高级中学2020-2021学年高三上学期第三次摸底考试理科数学试卷
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