1 . 如图所示,
是正三角形,
平面
,
,
,
,且F为
的中点.
平面
;
(2)求平面
与平面
所成二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af4a9a466a3b1a794f6190c860806de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317888e19b25197c633acd44eb855f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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2 . 已知菱形
的边长为2,
,如图1,沿对角线
将
向上折起至
,连接
,构成一个四面体
,如图2.
;
(2)若
,点
是
的中点,求平面
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c967c9b3f669ea78edd838e1d8b59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c18aba9681a8475968248764d4c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685534ba47e83433200ce29660875118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
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解题方法
3 . 如图,球
的内接八面体
中,顶点
分别在平面
两侧,四棱锥
,
均为正四棱锥,设二面角
的大小为
,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd9eb22f75ad5304d8491b314a9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c6caa0455442437177ab9b995df37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f96627abd793ca157d4dd1587f584d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43660b1543b3a2b46185f7629d28a963.png)
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2023-11-28更新
|
427次组卷
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4卷引用:四川省成都市第七中学2024届高三上学期期末数学(理)试题
(已下线)四川省成都市第七中学2024届高三上学期期末数学(理)试题浙江省绍兴市上虞区2020-2021学年高二上学期竞赛数学试题A组安徽省六安市毛坦厂中学2024届高三上学期12月月考数学试题(已下线)第5题 立体几何中以外接球为背景的最值问题(压轴小题)
名校
4 . 已知四棱锥的底面
为等腰梯形,
,
,
,
平面
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4710f75c66f19825a3e44b48f78bbac.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b60870baa5e3fbc33a749aa5f0a94be.png)
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2023-11-12更新
|
1832次组卷
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6卷引用:四川省眉山市彭山区第一中学2023-2024学年高二上学期12月月考数学试题
名校
5 . 如图,正三棱锥
中,E,F分别是侧棱AC,AD的中点,连接EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/ecf5dda8-6390-4ae7-958f-98e97b0aa0cf.png?resizew=152)
(1)判断AB与EF的位置关系,说明理由;
(2)若
,
,求平面BCD与平面BEF所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/ecf5dda8-6390-4ae7-958f-98e97b0aa0cf.png?resizew=152)
(1)判断AB与EF的位置关系,说明理由;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
您最近一年使用:0次
名校
6 . 如图,在三棱锥
中,平面
平面
,
是以
为斜边的等腰直角三角形,
,O为
中点.
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9095a9bff4632df01886773c21c0b834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/66db72ef-474e-4760-9aea-17b0834c2e36.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2023-11-03更新
|
673次组卷
|
3卷引用:四川省德阳市德阳中学校2023-2024学年高二上学期11月月考数学试题
四川省德阳市德阳中学校2023-2024学年高二上学期11月月考数学试题黑龙江省哈尔滨市兆麟中学2023-2024学年高二上学期期中考试数学试题(已下线)第二章 立体几何中的计算 专题一 空间角 微点7 二面角大小的计算(二)【基础版】
名校
7 . 如图,直角梯形
中,
,
为
的中点,以
为折痕把
折起,使点
到达点
的位置,且
,则下列结论错误的是
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc8b58dfbda662369d9b7b6a23aabd0.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.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/b1720da6d65e7fa854d98322d3864240.png)
![](https://img.xkw.com/dksih/QBM/2023/10/12/3344325421457408/3345060076544000/STEM/15650032a1f346c4a52809a42ed86f5f.png?resizew=4)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/20285024-904a-48bf-8200-7b470a4ccdcb.png?resizew=184)
A.![]() ![]() ![]() |
B.![]() |
C.二面角![]() ![]() |
D.平面![]() ![]() ![]() |
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8 . 如图
与
所在平面垂直,且
,
,则平面ABD与平面CBD的夹角的余弦值为 ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca76d0d2614f113bcd4c9e134b95123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7eb8d02ae228f12bed947432daabe2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/28/969609a8-6820-473c-b724-6ffbdec59136.png?resizew=155)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 如图1,已知平面四边形
是矩形,
,
,将四边形
沿
翻折,使平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
平面
,再将
沿着对角线
翻折,得到
,设顶点
在平面
上的投影为
.
(1)如图2,当
时,若点
在
上,且
,
,证明:
平面
,并求
的长度.
(2)如图3,当
时,若点
恰好落在
的内部(不包括边界),求二面角
的余弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7f709cd4bf123f329605b2f9ea679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ecf1fae571bafe7bb73efc6b6516463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58140fed320b904794b2b771f235950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/3bcfab02-6f71-4f7b-bee1-b5daa3e13b56.png?resizew=452)
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc66cd5ccd5a579a42c6a241c62d764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46902c589b964c055aee819dc3e4ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e281fa238514df41ec02e17313640d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9173b446b8ff3ec5506540f277d93a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de25bd0a6911c52d0d319c2318a67ef7.png)
您最近一年使用:0次
2023-10-20更新
|
451次组卷
|
6卷引用:四川省成都市成都市石室中学2023-2024学年高二上学期10月月考数学试题
四川省成都市成都市石室中学2023-2024学年高二上学期10月月考数学试题四川省资阳市乐至县乐至中学2023-2024学年高二上学期10月月考数学试题湖北省恩施州四校联盟2023-2024学年高二上学期期中联考数学试题(已下线)第14讲 8.6.3平面与平面垂直(第1课时 )-【帮课堂】(人教A版2019必修第二册)(已下线)第二章 立体几何中的计算 专题一 空间角 微点8 二面角大小的计算综合训练【基础版】(已下线)第八章 立体几何初步 单元复习提升(易错与拓展)(2)-单元速记·巧练(人教A版2019必修第二册)
10 . 如图,在棱长为1的正方体中,下列结论不正确 的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/265169a4-c337-49dc-9563-262e43c5d85a.png?resizew=161)
A.异面直线AC与![]() |
B.直线![]() ![]() |
C.二面角![]() ![]() |
D.四面体![]() ![]() |
您最近一年使用:0次
2023-10-18更新
|
619次组卷
|
3卷引用:四川省内江市第三中学2024届高三上学期1月月考数学(理)试题
四川省内江市第三中学2024届高三上学期1月月考数学(理)试题辽宁省六校协作体2023-2024学年高二上学期10月联考数学试题(已下线)专题09 立体几何(5大易错点分析+解题模板+举一反三+易错题通关)-2