解题方法
1 . 如图,在三棱锥
中,M为AC边上的一点,
,
,
,
.
平面
;
(2)若直线PA与平面ABC所成角的正弦值为
,且二面角
为锐二面角,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94b7928ff6145cccd4b64b0010a585d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75935f499493a6bdf92cab5ed82abe1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a910c896750506ffc2f8e29ce96435bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd3eb538f36e6e722e4ce125266b99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85db6f28f09fe9382a3ba571875f8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
(2)若直线PA与平面ABC所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039b5d69307f03fc40103a37f4b0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
您最近一年使用:0次
2024-04-15更新
|
750次组卷
|
3卷引用:四川省乐山市2024届高三第二次调查研究考试数学(理科)试题
2 . 如图,在四棱锥
中,底面
是正方形,
底面
,
,点
在棱
上,
平面
.
(1)试确定点
的位置,并说明理由;
(2)求平面
与平面
所成锐二面角的余弦值的取值范围.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37d3fd7d81e4b177dee8f8e30d93159.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/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/88f47c15-2f81-43bd-ad89-54de0b0226d2.png?resizew=164)
(1)试确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ca5b5fd1031438de2d2dd59be8c348.png)
您最近一年使用:0次
3 . 如图,正方形ABCD的边长为4,PA⊥平面ABCD,CQ⊥平面ABCD,
,M为棱PD上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/35d6814f-4dc2-40ca-a315-f347935e21d6.png?resizew=189)
(1)是否存在点M,使得直线
平面BPQ?若存在,请指出点M的位置并说明理由;若不存在,请说明理由;
(2)当
的面积最小时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3c8dadf9fc82e0e892d394a70ec7c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/35d6814f-4dc2-40ca-a315-f347935e21d6.png?resizew=189)
(1)是否存在点M,使得直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed357ec154cc4d69f9cfd278ac2015d1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad02b25bdc02a2e849b41b08dbaa6248.png)
您最近一年使用:0次
2023-05-08更新
|
432次组卷
|
3卷引用:四川省乐山市2023届高三三模理科数学试题
解题方法
4 . 在直三棱柱
中,
,
,点P满足
,其中
,则直线AP与平面
所成角的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209377196940bffa8ffa5f55b9c59fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97abea909791f73b84a07d3f15d8535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabc69a21cd6a75ded4c926985a8196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ea0512a1e43e7167ac1d2225b560cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
5 . 如图,在三棱锥
中,
为
的内心,直线
与
交于
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/6de15b2d-06b0-4fd5-bd6d-c55781aa52d6.png?resizew=188)
(1)证明:平面
平面
;
(2)若
,
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dbe55407b556be48d67cde5c5dc94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0c94e17dd00da31cd38d8d2a0f6ac5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/6de15b2d-06b0-4fd5-bd6d-c55781aa52d6.png?resizew=188)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392469b357b12b998528499929366c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91708c4508371f08556e76e31c7cb9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2547225b7d1f17b04a2077258be59ee7.png)
您最近一年使用:0次
2023-03-29更新
|
1591次组卷
|
8卷引用:四川省乐山市2023届高三下学期第二次调查研究考试数学(理)试题
四川省乐山市2023届高三下学期第二次调查研究考试数学(理)试题四川省遂宁市2023届高三第二次诊断性考试数学(理)试题四川省广安市2023届高三第二次诊断性考试数学(理)试题河北省秦皇岛市部分学校2023届高三二模联考数学试题四川省自贡市2023届高三第二次诊断性考试数学(理)试题(已下线)专题08 立体几何(理科)(已下线)专题14 押全国卷(理科)第18题 立体几何专题16空间向量与立体几何(解答题)
解题方法
6 . 已知四棱柱
的底面是正方形,
,
,点
在底面
的射影为
中点
,则直线
与平面
所成角的正弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf90bac174f02c4552e56df4d910bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-03-29更新
|
845次组卷
|
5卷引用:四川省乐山市2023届高三下学期第二次调查研究考试数学(理)试题
解题方法
7 . 如图,在四棱锥
中,
平面
,底面ABCD满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffbcd82b98a9ae69aa4ee28bb49a907.png)
,三角形
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08596ab7ad94031331c93db6f9ec549.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/82af416a-ba84-48a7-8b69-29ea46d5130f.png?resizew=169)
(1)画出平面PAB和平面PCD的交线,并说明理由,
(2)求平面PAB与平面PCD所成锐二面角的余弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffbcd82b98a9ae69aa4ee28bb49a907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfc9df9c661bd93b3f4f51f91534c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08596ab7ad94031331c93db6f9ec549.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/82af416a-ba84-48a7-8b69-29ea46d5130f.png?resizew=169)
(1)画出平面PAB和平面PCD的交线,并说明理由,
(2)求平面PAB与平面PCD所成锐二面角的余弦值.
您最近一年使用:0次
8 . 如图,已知在三棱柱
中,
,
,F是线段BC的中点,点O在线段AF上,
,D是侧棱
中点,
.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972987579703296/2976499759792128/STEM/e6fe36be-c2ab-484c-8915-58821d567e08.png?resizew=191)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
平面
;
(2)若
,点
在平面ABC内的射影为O,求直线OE与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e948030f3273f8a4060db3ea2c02c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4dd6192abb8c1e5fe39e981c726219.png)
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972987579703296/2976499759792128/STEM/e6fe36be-c2ab-484c-8915-58821d567e08.png?resizew=191)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
您最近一年使用:0次
2022-05-10更新
|
723次组卷
|
2卷引用:四川省乐山市2022届高三下学期第三次调查研究考试数学(理)试题
9 . 如图(1),已知
是边长为6的等边三角形,点
,
分别在
,
上,
,
是线段
的中点.将
沿直线
进行翻折,
翻折到点
,使得二面角
是直二面角,如图(2).
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941815315415040/2942384728064000/STEM/b3a8cbb4171042ae844ccdadbe99bb13.png?resizew=333)
(1)若
平面
,求
的长;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/1e987ef5b2677d3b860a9882770ac718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd02de808929ae04eb4185ef14592720.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941815315415040/2942384728064000/STEM/b3a8cbb4171042ae844ccdadbe99bb13.png?resizew=333)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7767d492158189b23af332a8016ed37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4193a34cda561b6404996e8050d404af.png)
您最近一年使用:0次
2022-03-23更新
|
575次组卷
|
5卷引用:四川省乐山市2022届第二次调查研究考试数学(理)试题
名校
10 . 《九章算术》中,将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为“阳马”.在如图所示的“阳马”
中,侧棱
底面
,
,点
是
的中点,作
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882935651655680/2886629337505792/STEM/e7862d9a-2d42-4c22-8495-e1bf7dee9920.png?resizew=252)
(1)求证:
平面
;
(2)若平面
与平面
所成的二面角为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d092c7e025551511ce7a5534a8e37f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882935651655680/2886629337505792/STEM/e7862d9a-2d42-4c22-8495-e1bf7dee9920.png?resizew=252)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce46aeb97373353179e5669365fa4a.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424dd73a238dad799c9296e9ff829253.png)
您最近一年使用:0次
2022-01-03更新
|
1114次组卷
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9卷引用:四川省乐山市高中2022届第一次调查研究考试数学(理)试题
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