1 . 如图3,已知二面角
的大小为
,菱形
在面
内,
两点在棱
上,
,
是
的中点,
面
,垂足为
.
(1)证明:
平面
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec3143f08cc5c757ff8fb16a2d7b9bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b7675ff57bdccb95a8241c1cd09f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820567942aa98b2feaaa017fcb7790df.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
您最近一年使用:0次
2016-12-03更新
|
2767次组卷
|
6卷引用:2014年全国普通高等学校招生统一考试文科数学(湖南卷)
真题
2 . 已知直线m,n和平面
满足
,则
![](https://img.xkw.com/dksih/QBM/2010/4/22/1569701467570176/1569701472493568/STEM/09fd18f8f5ba4217a669af247cc01a42.png?resizew=33)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b5a112306fbe4ab3af5e3832965d00.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
真题
3 . 如图,在圆锥
中,已知
,圆
的直径
,点
在
上,且
,
为
的中点.
(I)证明:
平面
;
(II)求直线OC和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e89e99ab9c1ece0cc5c3bbabaa97de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f97827d23a27efaf3d639f3abe430c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(I)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15b63176f43bc7a0654d0f6f45e7429.png)
(II)求直线OC和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244770725888/1570244776255488/STEM/b4b59d5c-acfa-4a41-80fa-1868b4605bf4.png?resizew=193)
您最近一年使用:0次
真题
解题方法
4 . 如图,在底面边长为2的正三棱锥
中,E是
的中点,若
的面积是
,则侧棱
与底面所成角的大小为____________ .(结果用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cada7fdf7deae5225f1145680fd895d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/3872b2f1-4bed-41cc-8852-a3b5151cfa12.png?resizew=152)
您最近一年使用:0次
5 . 正方体
的棱长为1,E是
的中点,则E到平面
的距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-07-10更新
|
264次组卷
|
3卷引用:2005年普通高等学校招生考试数学(文)试题(湖南卷)
真题
6 . 如图,已知直二面角
,
,
,
,
,
,直线
和平面
所成的角为
.
(1)证明
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b14bd1b2cbaf85c43b149e572befa43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b77be146c65b7b9f7b1d0cbc981a822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2a47e92905ab5564a0c60951d332a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b337dd084091eb575895a6278e828320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dbf8f143a9b9c028649dcc8d930d510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142c742a4226a2a6873bd55ca8b1f021.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e67a35615a7a9b3aeb0212a62cef30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/d863cdcd-8b55-4af2-909a-c499c6e847dc.png?resizew=201)
您最近一年使用:0次
2016-11-30更新
|
1435次组卷
|
2卷引用:2007年普通高等学校招生全国统一考试文科数学卷(湖南)
7 . 如图,在正三棱柱
中,AB=4,
,点D是BC的中点,点E在AC上,且DE![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/ac9f4531-0af8-4657-a57a-57f8328adee0.png?resizew=163)
(Ⅰ)证明:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
平面
;
(Ⅱ)求直线AD和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab527e1b5f124429b532804ef3f870f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/ac9f4531-0af8-4657-a57a-57f8328adee0.png?resizew=163)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(Ⅱ)求直线AD和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
您最近一年使用:0次
8 . 如图所示,点
为斜三棱柱
的侧棱
上一点,
交
于点
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/22/1573089691934720/1573089698439168/STEM/7972e989-11cc-4b62-94c9-7f0e0d290d3f.png?resizew=194)
(1)求证:
;
(2)在任意
中有余弦定理:
.拓展到空间,类比三角形的余弦定理,写出斜三棱柱的三个侧面面积与其中两个侧面所成的二面角之间的关系式,并予以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60b83e5a713c9d0409bf544c514f602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88d952630ddac66a1f077dcc9439990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/22/1573089691934720/1573089698439168/STEM/7972e989-11cc-4b62-94c9-7f0e0d290d3f.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0937dc905b06383bd34d5f9ae8384a.png)
(2)在任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e46534c1cb9de14c258eef9244272b5.png)
您最近一年使用:0次
2016-12-04更新
|
627次组卷
|
6卷引用:2004 年普通高等学校招生考试数学试题(上海卷)
2004 年普通高等学校招生考试数学试题(上海卷)2016-2017学年江西南昌市高三新课标一轮复习一数学试卷沪教版(上海) 高三年级 新高考辅导与训练 第九章 空间图形与简单几何体 三、多面体上海市闵行第三中学2022-2023学年高二上学期10月月考数学试题沪教版(2020) 必修第三册 高效课堂 第十章 每周一练(2)(已下线)第五章 破解立体几何开放探究问题 专题一 立体几何存在性问题 微点1 立体几何存在性问题的解法【培优版】