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1 . 已知四面体ABCD的棱长均为2,则( )
A.![]() | B.直线AB与平面BCD所成的角的正弦值为![]() |
C.点A到平面BCD的距离为![]() | D.两相邻侧面夹角的余弦值为![]() |
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2023-03-03更新
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460次组卷
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2卷引用:吉林省通化市梅河口市第五中学2023届高三下学期二模考试数学试题
解题方法
2 . 如图,在多面体ABCDEF中,四边形ABCD为菱形,且∠DAB=60°,四边形BDEF为矩形,BD=2BF=2,AC与BD交于O点,FA=FC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/e4915032-ca40-43b6-a11e-809dd03a9e98.png?resizew=227)
(1)求证:AC⊥平面BDEF;
(2)求二面角F-AE-C的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/e4915032-ca40-43b6-a11e-809dd03a9e98.png?resizew=227)
(1)求证:AC⊥平面BDEF;
(2)求二面角F-AE-C的余弦值.
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解题方法
3 . 在空间四边形
中
,
,
,二面角B-AC-D的余弦值为
,则空间四边形ABCD的外接球的表面积为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb96adfb8797efefab28691d6acbd6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e6c6087ac46b0c1289f43a86d73bd4.png)
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2023-01-03更新
|
224次组卷
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2卷引用:吉林省松原市前郭尔罗斯蒙古族自治县第五中学2022-2023学年高三上学期期末考试数学试题
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解题方法
4 . 如图,已知底面为正三角形的直三棱柱ABC-A1B1C1中,AA1=AB,D为AB的中点,E为CC1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/3896be36-0206-46e6-b883-2663b4ab9678.png?resizew=159)
(1)证明:平面CDC1⊥平面C1AB;
(2)求二面角A-BC1-E的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/3896be36-0206-46e6-b883-2663b4ab9678.png?resizew=159)
(1)证明:平面CDC1⊥平面C1AB;
(2)求二面角A-BC1-E的余弦值.
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解题方法
5 . 如图,在棱长为1的正方体
中( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/af7c62fc-8866-4f0f-8b67-71f35eaee264.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/af7c62fc-8866-4f0f-8b67-71f35eaee264.png?resizew=163)
A.![]() ![]() ![]() |
B.二面角![]() ![]() |
C.![]() ![]() ![]() |
D.点![]() ![]() ![]() |
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2022-12-13更新
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6 . 如图,在棱长为
的正方体
中,下列选项正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/44dd3829-d82e-4d9a-a628-2d0a9bb76d29.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/44dd3829-d82e-4d9a-a628-2d0a9bb76d29.png?resizew=169)
A.异面直线![]() ![]() ![]() | B.三棱锥![]() ![]() |
C.直线![]() ![]() | D.二面角![]() ![]() |
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2022-11-15更新
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4卷引用:吉林省长春汽车经济技术开发区第三中学2023-2024学年高二上学期10月月考数学试题
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7 . 如图,在直角梯形
中,
,
,
,沿对角线
将
折至
的位置,记二面角
的平面角为
.
时,求证:平面
平面
;
(2)若
为
的中点,当
时,求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abfb2735e1683a6ae86b5b97a0032e4f.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/a3ea25ef38e4afa8f75ffd0842890289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc66a96c1297e7068e987e0e70723e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b12fe9a4054ffbacca1b995751969a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10211cd11867a47707eda04e4c2b56c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd148d264bc9043396f777523e907aa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a24d333fbac6a24e949408643f62836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413057311afa5daa3815d4afd08dd3a1.png)
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2022-09-29更新
|
716次组卷
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5卷引用:吉林省东北师范大学附属中学2022-2023学年高二上学期第一次月考数学试题
吉林省东北师范大学附属中学2022-2023学年高二上学期第一次月考数学试题(已下线)考向30 立体几何中的最值、翻折、探索性问题(重点)(已下线)第八章立体几何初步章末题型大总结(精讲)(2)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)安徽省合肥市第七中学2022-2023学年高一下学期第二次单元检测(月考)数学试题山东省烟台市莱州市第一中学2023-2024学年高一下学期6月月考数学试题
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8 . 如图,在四棱锥
中,底面
为菱形,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/2d947422-947c-4f38-94f2-225d23d91840.png?resizew=171)
(1)证明:
平面
;
(2)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39df09be2183c9b5c2f066bb3f5f938.png)
,
,且
,求平面
与平面
夹角的余弦值.
![](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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ccd2c4b9ef8b0b42ab92635adf7e4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/2d947422-947c-4f38-94f2-225d23d91840.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39df09be2183c9b5c2f066bb3f5f938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae139b51956b9281d73d9ba82b875e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1365206d14224e0b2d40a7bd8b7965ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2022-09-28更新
|
484次组卷
|
4卷引用:吉林省长春外国语学校2022-2023学年高二上学期第一次月考数学试题
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解题方法
9 . 如图在三棱锥
中,
,
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/854bb308-b37e-454e-8dd1-bc3add42c764.png?resizew=184)
(1)求证:平面
平面ABC
(2)若E为OC中点,求平面ABC与平面EAB所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa636ff9db826a445a871cb35ffbe63e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b3f727e9944ab41086b233975565b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54276d36db232bc3ae6327f757241c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/854bb308-b37e-454e-8dd1-bc3add42c764.png?resizew=184)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e423b8c33dad4cda6b8d4ee26f14834b.png)
(2)若E为OC中点,求平面ABC与平面EAB所成锐二面角的余弦值.
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2022-07-23更新
|
1255次组卷
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4卷引用:吉林省长春市实验中学2021-2022学年高一下学期期末考试数学试题
吉林省长春市实验中学2021-2022学年高一下学期期末考试数学试题福建省南平市2021-2022学年高二上学期期末质量检测数学试题重庆市缙云教育联盟2022届高三下学期2月质量检测数学试题(已下线)第09讲 立体几何与空间向量 章节总结 (讲)-1
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10 . 已知在四棱锥
中,
平面
,
,
∥
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/3ecf2440-9eed-4b09-8a5d-d89ed75b8e84.png?resizew=216)
(1)求证:
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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a69df64811eb0866c84207f24dfae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/3ecf2440-9eed-4b09-8a5d-d89ed75b8e84.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f3abe8876333c19ae7e36c98a9329b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972ddb098bf2f606cd2de6522d04097d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b4e098c6194f55462b24f552f5967.png)
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