1 . 如图,将一副三角板拼接,使它们有公共边BC,且使两个三角形所在的平面互相垂直,若
∠BAC=90°,AB=AC,∠CBD=90°,∠BDC=60°,BC=6.
![](https://img.xkw.com/dksih/QBM/2018/7/17/1990443664089088/1991739199471616/STEM/9c6799196cef4155a4302f9755b60d41.png?resizew=156)
⑴ 求证:平面
平面ACD;
⑵ 求二面角
的平面角的正切值;
⑶ 设过直线AD且与BC平行的平面为
,求点B到平面
的距离.
∠BAC=90°,AB=AC,∠CBD=90°,∠BDC=60°,BC=6.
![](https://img.xkw.com/dksih/QBM/2018/7/17/1990443664089088/1991739199471616/STEM/9c6799196cef4155a4302f9755b60d41.png?resizew=156)
⑴ 求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
⑵ 求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d1c5eace748465b2dad5065f5111c.png)
⑶ 设过直线AD且与BC平行的平面为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2018-07-19更新
|
474次组卷
|
2卷引用:湖南省长沙市南雅中学2018-2019学年高一下学期3月月考数学试题
名校
2 . 如图,矩形
中,
,
,点
是
上的动点.现将矩形
沿着对角线
折成二面角
,使得
.
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868246455328768/1870892244787200/STEM/dfc8d3dd4bf04bccae66216a5a47e575.png?resizew=470)
(Ⅰ)求证:当
时,
;
(Ⅱ)试求
的长,使得二面角
的大小为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509f0ff9afda21ed0266fb470fbb805e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7916c7398624ef0668af4cdb25060a.png)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868246455328768/1870892244787200/STEM/dfc8d3dd4bf04bccae66216a5a47e575.png?resizew=470)
(Ⅰ)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f414cce1427646590a7f7144efe2e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4971fb55ecbf38caa1113019294c5a9b.png)
(Ⅱ)试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0748817aa9841c369279e68e12717b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次
2018-01-29更新
|
1090次组卷
|
5卷引用:2020届湖南省长沙市长郡中学高三下学期3月停课不停学阶段性测试数学(理)试题
2020届湖南省长沙市长郡中学高三下学期3月停课不停学阶段性测试数学(理)试题福建省宁德市2018届高三第一次质量检查数学理试题(已下线)专题02 从空间到平面,助力破解立体几何问题 (第四篇)-2020高考数学压轴题命题区间探究与突破安徽省滁州市定远县民族中学2020-2021学年高二上学期10月月考数学(理)试题(已下线)9.5 空间向量与立体几何
名校
3 . 如图,
是
直径,
所在的平面,
是圆周上不同于
、
的动点.
(1)证明:平面
平面
;
(2)若
,且当二面角
的正切值为
时,求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1823a9f8a6e9ff64261bb9ce145c8b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/2018/1/10/1857157750530048/1858303324520448/STEM/9a8993c658eb4cd697c8f6c14ba724dd.png?resizew=185)
您最近一年使用:0次
2018-01-11更新
|
677次组卷
|
2卷引用:湖南省长沙市第一中学2017-2018学年高一上学期第二次阶段性检测数学试题
名校
4 . 三棱锥被平行于底面ABC的平面所截得的几何体如图所示,截面为A1B1C1,∠BAC=90°,A1A⊥平面ABC,A1A=
,AB=
,AC=2,A1C1=1,
.
(1)证明:BC
A1D;
(2)求二面角A-CC1-B的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0870515b612ef842f01f3b5eeca220b5.png)
(1)证明:BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)求二面角A-CC1-B的余弦值.
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896189515472896/1903293946019840/STEM/d95a5686-1951-4424-b8ac-4229e9b94db3.png)
您最近一年使用:0次
2018-03-16更新
|
496次组卷
|
6卷引用:湖南省长沙市雅礼中学2018-2019学年高一上学期期末数学试题
5 . 如图,四棱锥
中,平面
平面
,底面
为梯形,
,且
与
均为正三角形,
为
的重心.
![](https://img.xkw.com/dksih/QBM/2017/5/19/1690473527287808/1691631525478400/STEM/55ced9c5cee74e05955037be12c12979.png?resizew=121)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f8126eff3bb2c4982723d967879e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://img.xkw.com/dksih/QBM/2017/5/19/1690473527287808/1691631525478400/STEM/55ced9c5cee74e05955037be12c12979.png?resizew=121)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf60ad9db3411f35704fa88d86bfef5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e3189ee19551c4fb5dfe8bd1a73329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2017-05-21更新
|
1104次组卷
|
2卷引用:【全国百强校】湖南省长沙市长郡中学2019届高三下学期第六次月考数学(理)试题
6 . 如图,在四棱锥
中,底面
是正方形,
底面
,
, 点
是
的中点,
,且交
于点
.
(Ⅰ)求证:
平面
;
(Ⅱ)求证:平面
⊥平面
;
(Ⅲ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93767331e9bac06a564973a9f4fc663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f04e6ed01c8f3778a64f055d33ee70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/d42cc5d6-f31f-49ae-a78c-72125039babb.png?resizew=154)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30e2f7b22d83bef3421a4ecc7ed4a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
(Ⅲ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6772edef04d878a91bf4d7e8419a4628.png)
您最近一年使用:0次
2016-12-03更新
|
1727次组卷
|
3卷引用:2015届湖南省长沙市高考模拟理科数学试卷
7 . 如图,正方体
的棱长为
,
分别为
的中点.
(1)求证:
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d52429789f22fe9061973e123a038d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f5572d9521e112be8148fea4d7241f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16155b0c208b346e93529385c8793b49.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74534a54d7271e1b95fd3a74121468b.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625334186016768/1632305636458496/STEM/3ef8953362d0463789f94b1d9d73efde.png?resizew=218)
您最近一年使用:0次
2017-02-26更新
|
473次组卷
|
2卷引用:湖南省长沙市宁乡市2019-2020学年高一下学期期末数学试题
8 . 如图所示,矩形
和矩形
所在平面互相垂直,
与平面
及平面
所成的角分别为
,
,
、
分别为
、
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/53eb33c8-f548-42f8-ba17-3ba8c8dfb1c2.png?resizew=129)
(1)求证:
平面
;
(2)求线段
的长;
(3)求二面角
的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c096bd244d7e30e8ef26fb5278aac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/53eb33c8-f548-42f8-ba17-3ba8c8dfb1c2.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
您最近一年使用:0次
9 . 如图,在四棱锥
中,
平面
,底面
是平行四边形,
,
为
与
的交点,
为棱
上一点.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625063100178432/1626777178349568/STEM/f7df7ba3bfcc4b569f8537b3c50cb967.png?resizew=188)
(1)证明:平面
平面
;
(2)若
,求二面角
的大小.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a5a31a6e5eb13283659cdec9ad727f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186354626d5a1d13b88dfb4df916947b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83511c460cbd4800bfa13a986c445fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11cead3a2eeb8d1fad779b04e8464e58.png)
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625063100178432/1626777178349568/STEM/f7df7ba3bfcc4b569f8537b3c50cb967.png?resizew=188)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d669df6c391aa83150df5ae96c39d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
您最近一年使用:0次
2017-02-18更新
|
898次组卷
|
3卷引用:湖南省长沙市第一中学2016-2017学年高一上学期期末考试数学试题
2011·河北唐山·二模
名校
10 . 如图,在四棱锥P-ABCD中,底面ABCD是一直角梯形,
,AD//BC,AB=BC=1,AD=2,PA⊥底面ABCD,PD与底面成
角,点E是PD的中点.
![](https://img.xkw.com/dksih/QBM/2011/4/3/1576740407533568/1576740493672448/STEM/c0231678d2ff4cf99b1ec6405f02f293.png?resizew=172)
(1)求证:BE⊥PD;
(2)求二面角P-CD-A的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e45b6f8cf0260912f587c04f9f2442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://img.xkw.com/dksih/QBM/2011/4/3/1576740407533568/1576740493672448/STEM/c0231678d2ff4cf99b1ec6405f02f293.png?resizew=172)
(1)求证:BE⊥PD;
(2)求二面角P-CD-A的余弦值.
您最近一年使用:0次
2016-12-10更新
|
1140次组卷
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4卷引用:湖南省长沙市雅礼中学2020-2021学年高一下学期5月第三次月考试题
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