解题方法
1 . 如图,在四面体
中,
,
,则二面角
的余弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/247de74a-e151-4d78-8245-a7fd2416f068.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242b14a89363fa1e1a3b74ed989a5311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0045c94d47ee484d8982473538c89c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5722552a4813f60bd05fe0f346133c65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/247de74a-e151-4d78-8245-a7fd2416f068.png?resizew=153)
A.![]() | B.![]() | C.1 | D.![]() |
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名校
解题方法
2 . 已知矩形
,
,
,沿对角线
将
折起,使得
,则二面角
的大小是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a439406eca299c91f6b0a3ed66dd3370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
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2020-11-15更新
|
412次组卷
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3卷引用:天津市第五十五中学2020-2021学年高二(上)第一次月考数学试题
3 . 如图,四边形
为正方形,四边形
为矩形,
,
平面
,点
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/616c681a-8f80-4c3e-8db5-04dd9f02ab7f.png?resizew=188)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fb87890d12b6f1125057d9fb3ac274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/616c681a-8f80-4c3e-8db5-04dd9f02ab7f.png?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf30f4076f9d389add8939311004303.png)
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2020-11-14更新
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375次组卷
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2卷引用:天津市益中学校2022-2023学年高三上学期第一次学情调研数学试题
4 . 如图所示,在四棱锥P-ABCD中,底面ABCD为平行四边形,PA⊥平面ABCD,且PA=
,AB=1,BC=2,AC=
,则异面直线
与
所成的角等于_____ ;二面角P-CD-B的大小_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589144745713664/2591333102510080/STEM/6b9c6d4d-6752-4cc2-82b6-340aaed31075.png?resizew=202)
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2020-11-12更新
|
1051次组卷
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3卷引用:天津市耀华中学2019-2020学年高一下学期期末数学试题
5 . 如图,在五面体ABCDEF中,FA⊥平面ABCD,AD//BC//FE,AB⊥AD,M为EC的中点,AF=AB=BC=FE=
AD.
(II)求二面角A﹣CD﹣E的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(II)求二面角A﹣CD﹣E的余弦值.
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解题方法
6 . 在三棱锥P-ABC中,∠APB=90°,∠PAB=60°,AB=BC=CA,平面PAB⊥平面ABC.
(1)求直线PC与平面ABC所成角的正弦值;
(2)求二面角B-AP-C的余弦值.
(1)求直线PC与平面ABC所成角的正弦值;
(2)求二面角B-AP-C的余弦值.
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解题方法
7 . 如图,正方体
的棱长为1,E、F分别为棱AD、BC的中点,则平面
与底面ABCD所成的二面角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354ee41dcce9ed93fb835cc6364e8490.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-11-07更新
|
983次组卷
|
8卷引用:天津市东丽区2020-2021学年高一下学期期末数学试题
名校
8 . 如图,在四棱锥
中,底面
是直角梯形,
,
,又
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/7/7/2500847985950720/2501446662037504/STEM/2aac632b287a46a8b62b55ebd5048073.png?resizew=189)
(1)求证:
平面
;
(2)求
与平面
所成角的余弦值;
(3)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/4e320a45fdb0f3339eff27dd0c608117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4a839219c4010312add8dd20428824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26a42b05e06fe34d66538930787bb3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
![](https://img.xkw.com/dksih/QBM/2020/7/7/2500847985950720/2501446662037504/STEM/2aac632b287a46a8b62b55ebd5048073.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa431d661bf9f419e8ab713dd4a3c80.png)
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2020-07-08更新
|
359次组卷
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2卷引用:天津市南开区南开中学2020届高三下学期第六次月考数学试题
9 . 如图,等腰直角三角形ABC所在的平面与半圆弧AB所在的平面垂直,AC⊥AB,P是弧AB上一点,且∠PAB=30°.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480942574239744/2481757743964160/STEM/ac9ffb71-ca66-4338-8775-a8b2840174dc.png?resizew=254)
(1)证明:平面BCP⊥平面ACP;
(2)若Q是弧AP上异于A、P的一个动点,当三棱锥C-APQ体积最大时,求二面角A-PQ-C的余弦值.
![](https://img.xkw.com/dksih/QBM/2020/6/9/2480942574239744/2481757743964160/STEM/ac9ffb71-ca66-4338-8775-a8b2840174dc.png?resizew=254)
(1)证明:平面BCP⊥平面ACP;
(2)若Q是弧AP上异于A、P的一个动点,当三棱锥C-APQ体积最大时,求二面角A-PQ-C的余弦值.
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2020-06-10更新
|
417次组卷
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5卷引用:数学-6月大数据精选模拟卷05(天津卷)(满分冲刺篇)
(已下线)数学-6月大数据精选模拟卷05(天津卷)(满分冲刺篇)安徽省蚌埠市2020届高三下学期高考模拟考试数学(理)试题安徽省蚌埠市2020届高三下学期第四次教学质量检查数学(理)试题广东省佛山市第一中学2019-2020学年高一下学期6月联考数学试题(已下线)专题22第一篇 热点、难点突破(测试卷一)(测)(理科)第一篇 热点、难点突破篇-《2022年高考理科数学二轮复习讲练测》(全国课标版)
名校
10 . 如图,在三棱锥
中,
平面
,△
是直角三角形,
,
,
,点
、
、
分别为
、
、
的中点.
;
(2)求直线
与平面
所成的角的正弦值;
(3)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96d9e134e1820d80612be1bc590993e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521018fbf59681c18e94d56600a1a80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7459863f058993e17b7dcf902053eccd.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f33997d5b4a0d9a3feafc1a075bc56.png)
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2020-08-06更新
|
1847次组卷
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6卷引用:天津市滨海新区塘沽第一中学2020-2021学年高三上学期第二次月考数学试题
天津市滨海新区塘沽第一中学2020-2021学年高三上学期第二次月考数学试题内蒙古包钢一中2019-2020学年高二上学期10月月考数学试题宁夏平罗中学2019-2020学年高二上学期期中考试数学(理)试题(已下线)全册综合测试模拟二-【新教材精创】2019-2020高一数学新教材知识讲学(人教A版必修第二册)-《高中新教材知识讲学》广东省肇庆市第一中学2023-2024学年高二上学期开学考试数学试题河南省周口市太康县第一高级中学2023-2024学年高一下学期5月月考数学试题