1 . 如图,α⊥β,α∩β=l,A∈α,B∈β,点A在直线l上的射影为A1, 点B在l的射影为B1,已知AB=2,AA1=1,BB1=
, 求:
(Ⅰ) 直线AB分别与平面α,β所成角的大小;
(Ⅱ)二面角A1-AB-B1的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(Ⅰ) 直线AB分别与平面α,β所成角的大小;
(Ⅱ)二面角A1-AB-B1的余弦值.
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2011·广东深圳·二模
2 . 如图1,在直角梯形ABCD中,AB∥CD,AB⊥AD,且AB=AD
CD=1.现以AD为一边向形外作正方形ADEF,然后沿边AD将正方形ADEF翻折,使平面ADEF与平面ABCD互相垂直,如图2.
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133298298880/1570133303689216/STEM/e5737ae9b15e401eb7554bf935f7b337.png?resizew=547)
(1)求证:平面BDE⊥平面BEC;
(2)求平面ABCD与平面EFB所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50a39604477d1d9326eb455cda2e838.png)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133298298880/1570133303689216/STEM/e5737ae9b15e401eb7554bf935f7b337.png?resizew=547)
(1)求证:平面BDE⊥平面BEC;
(2)求平面ABCD与平面EFB所成锐二面角的大小.
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2011·广东广州·一模
3 . 一个几何体是由圆柱
和三棱锥
组合而成,点
、
、
在圆
的圆周上,其正(主)视图、侧(左)视图的面积分别为10和12,如图3所示,其中
平面
,
,
,
.
(1)求证:
;
(2)求二面角
的平面角的大小.
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/71b3d38a0dc34dffa1fab1b2ef2bbde3.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/27111b366e8541f4a0b884b11136e6ef.png?resizew=498)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f00a2efdc6171e9455c402f62e9d737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/71b3d38a0dc34dffa1fab1b2ef2bbde3.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131275530240/1570131281141760/STEM/27111b366e8541f4a0b884b11136e6ef.png?resizew=498)
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4 . 各棱长均为2的斜三棱柱ABC—DEF中,已知BF⊥AE, BF∩CE=O,AB=AE,连结AO.
(I)求证:AO⊥平面FEBC.
(II)求二面角B—AC—E的大小.
(III)求三棱锥B—DEF的体积.
(I)求证:AO⊥平面FEBC.
(II)求二面角B—AC—E的大小.
(III)求三棱锥B—DEF的体积.
您最近一年使用:0次
真题
5 . 如图5,
是半径为a的半圆,AC为直径,点E为
的中点,点B和点C为线段AD的三等分点.平面AEC外一点F满足
,FE=
a .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/34a44e7b-3aca-4777-9a25-0d507d6d1ceb.png?resizew=231)
图5
(1)证明:EB⊥FD;
(2)已知点Q,R分别为线段FE,FB上的点,使得
,求平面
与平面
所成二面角的正弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e25925b36bc54fd1905f513168232f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf92f47c9d324d4072c3219d9172119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce2580bf2a0398ee21f5f16b19a4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27ff057bd4c1e5c216ed4e338af8949.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/34a44e7b-3aca-4777-9a25-0d507d6d1ceb.png?resizew=231)
图5
(1)证明:EB⊥FD;
(2)已知点Q,R分别为线段FE,FB上的点,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54cbbf2a0ccb763d0254e89f81bd395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae8dcf621f2dbdbac6407dddb353c9.png)
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2010·广东揭阳·二模
6 . 如图,△ABC内接于圆O,AB是圆O的直径,四边形DCBE为平行四边形,DC
平面ABC ,
,已知AE与平面ABC所成的角为
,且
.
(1)证明:平面ACD
平面
;
(2)记
,
表示三棱锥A-CBE的体积,求
的表达式;
(3)当
取得最大值时,求二面角D-AB-C的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb57c016d0f0e8585f06dcbf28c619e5.png)
(1)证明:平面ACD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bfc0387785bf3c60f75ed3d34cc98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014bde89c2e67acf72df101609d5ba17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014bde89c2e67acf72df101609d5ba17.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014bde89c2e67acf72df101609d5ba17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/8063e9b0-adc0-4a01-b2ee-fe505041fb15.png?resizew=157)
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真题
7 . 如图,在直三棱柱
中,平面
侧面A1ABB1.
(Ⅰ)求证:
;
(Ⅱ)若直线AC与平面A1BC所成的角为θ,二面角A1-BC-A的大小为φ,试判断θ与φ的大小关系,并予以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
(Ⅱ)若直线AC与平面A1BC所成的角为θ,二面角A1-BC-A的大小为φ,试判断θ与φ的大小关系,并予以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b28f4071-53aa-4014-995c-ca4e7f2d90af.png?resizew=151)
您最近一年使用:0次
2016-11-30更新
|
1711次组卷
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6卷引用:2008年普通高等学校招生全国统一考试理科数学(湖北卷)
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