1 . 如图,四棱锥
中,底面
是边长为2的菱形,
,
,
.
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
您最近一年使用:0次
2018-01-08更新
|
1855次组卷
|
7卷引用:湖南省长沙市雅礼中学2023届高三下学期月考(六)数学试题
2 . 如图,在三棱柱
中,平面
平面
,
,
,
,![](https://img.xkw.com/dksih/QBM/2017/4/19/1669166111318016/1669392245547008/STEM/b34a01dbcc31440596eb8f6116704ed1.png?resizew=3)
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2017/4/19/1669166111318016/1669392245547008/STEM/0b69783db3424875b9b1c5a26c45cb75.png?resizew=273)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3cbaef6648895a366bf56f415b70ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bdef06cf0abf8c2fb3e3ac9272d340a.png)
![](https://img.xkw.com/dksih/QBM/2017/4/19/1669166111318016/1669392245547008/STEM/b34a01dbcc31440596eb8f6116704ed1.png?resizew=3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4fcf607b0710d12aaabd17fd053d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2017/4/19/1669166111318016/1669392245547008/STEM/0b69783db3424875b9b1c5a26c45cb75.png?resizew=273)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34254a0f46f943e1c720f0eefccd28eb.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c6ee40dff32baf8ffbf3cd4562c25a.png)
您最近一年使用:0次
2017-04-17更新
|
813次组卷
|
2卷引用:湖北省武汉市2017届高三毕业生四月调研测试数学(理)试题
2012·河北唐山·一模
名校
3 . 如图,在三棱柱
中,
底面ABC,底面是边长为2的正三角形,M, N分别是棱
的中点.
(1)求证:
平面
;
(2)若二面角
为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d8e7d5e56fa1b93b91a53cd28d5b2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d1a33c15403d74a109be9f6b68849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c72338a356ad5c1715719a18e6ef27.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d447ce2833cac5260ed5532283fa3997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc9b033a4c5c6eb072c73a8f2c5617b.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f42830f8709f79ac371f92879d6895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
您最近一年使用:0次
4 . 如图,在多面体
中,底面
是边长为2的菱形,
,四边形
是矩形,平面
平面
.
(1)在图中画出过点
的平面
,使得
平面
(必须说明画法,不需证明);
(2)若二面角
是
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b6711e6dd48be6cf8fa52926924d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)在图中画出过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60be170a52db82cf37b30db0cde26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2fd494ec8c370a22ae16699eac4cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/30/88270266-0236-44d8-9a0f-f9037646233d.jpg?resizew=140)
您最近一年使用:0次
2017-04-13更新
|
879次组卷
|
2卷引用:河北省衡水市第二中学2023-2024学年高二上学期学科素养评估(三调)数学试题
5 . 如图,在三棱锥
中,
,
在底面
上的射影为
,
,
于
.
![](https://img.xkw.com/dksih/QBM/2016/3/8/1572526056292352/1572526062632960/STEM/5f01c63d515143c3ac60a0599554b333.png?resizew=237)
(1)求证:平面
平面
;
(2)若
,
,
,求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f630195bcf6c3ca8f4fdeff43b082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/3/8/1572526056292352/1572526062632960/STEM/5f01c63d515143c3ac60a0599554b333.png?resizew=237)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddc76d96d6951ebfef3fe63892a1114.png)
您最近一年使用:0次
2016-12-04更新
|
831次组卷
|
4卷引用:2016-2017学年河北冀州市中学高二上月考二理数学试卷
6 . 如图,在直三棱柱
中,
平面
,其垂足
落在直线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/756978e0-cb7b-4dfa-8411-033b3efc7769.png?resizew=193)
(1)求证:
;
(2)若
,
,
为
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/756978e0-cb7b-4dfa-8411-033b3efc7769.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dec5aabef249f61d52166823dc053ff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d034916a91074312a6b43d4123bf3e.png)
您最近一年使用:0次
10-11高二·黑龙江·阶段练习
7 . 如图,多面体
中,底面
为正方形,
,
平面
,其正视图、俯视图如下:
(1)求证:平面
平面
;
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570119380516864/1570119385907200/STEM/f9f02c3fdf324dfe8efc816cb3038992.png?resizew=435)
(2)若存在
使得
,二面角
的大小为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc1daa85228e300e0f22f9047aa9b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1011c33a1243502d5a428a4e2a127d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb10d645970e5860afd3430957fab6c.png)
![](https://img.xkw.com/dksih/QBM/2011/4/14/1570119380516864/1570119385907200/STEM/f9f02c3fdf324dfe8efc816cb3038992.png?resizew=435)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0363ec365436c2108fabc44c54b52b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4336180e56d5c02c75c9715bbd93a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次