1 . 如图,在三棱柱
中,
,
,且
在平面ABC内的正投影为BC上的点D.过D作平面
的垂线,垂足为E,连接
并延长交AB于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/ba2b411c-ea06-4225-b6ab-d55c4568bf37.png?resizew=270)
(1)证明:
平面
;
(2)若D为BC中点,求DE与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/ba2b411c-ea06-4225-b6ab-d55c4568bf37.png?resizew=270)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26dee2a75ce2b52cdceefc5e863ac5bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若D为BC中点,求DE与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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名校
2 . 如图,四棱锥
的底面是正方形,PD⊥底面ABCD,M为BC的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/04fbe7f2-4455-439a-8be8-8581737477fb.png?resizew=181)
(1)证明:
;
(2)设平面
平面
,求l与平面MND所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37e0c53d731558f9c41d242609da552.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/04fbe7f2-4455-439a-8be8-8581737477fb.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a90c593db2843334fd70acbb37320d.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1084a42a7b7600ac9651a023de6d3401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebae74545340ce6971f437d129e9c659.png)
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2022-02-21更新
|
336次组卷
|
2卷引用:福建省三明市普通高中2021-2022学年高二上学期期末质量检测数学试题
名校
解题方法
3 . 如图,在四棱锥
中,
,
,
,平面
平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/d8dee249-e133-4f35-aca8-f9cbba1cddcc.png?resizew=180)
(1)求证:
;
(2)已知二面角
的余弦值为
.线段PC上是否存在点M,使得BM与平面PAC所成的角为30°?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946470cef32a0bd769b3809351d8ee61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279e119eed905cf15026649a1b86502a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/d8dee249-e133-4f35-aca8-f9cbba1cddcc.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
(2)已知二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9f1e2b86f4eca37c72011d3dffb0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1145c162038df3c7184d9201c628e.png)
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2021-01-13更新
|
974次组卷
|
5卷引用:福建省三明市2021届高三上学期期末质量检测数学试题
4 . 如图,在三棱锥
中,平面
平面
,
为棱
上的一点,且
,
为棱
的中点,
为棱
上的一点,若
平面
,
是边长为4的正三角形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/17d00bb2-8ef4-4fc4-a955-61de82c9d6ac.png?resizew=129)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4765929cc8db9aa665352918cd010a7.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9626299838b5f0a615446341a6dca450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8c4900c397f43af3592651f5175b22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/17d00bb2-8ef4-4fc4-a955-61de82c9d6ac.png?resizew=129)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5394d00a80a5900d7fd7d9961868bd22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
您最近一年使用:0次
2010·河南驻马店·一模
名校
5 . 如图,正方形ACDE所在的平面与平面ABC垂直,M是CE和AD的交点,AC
BC,且AC=BC.
平面EBC;
(2)求直线AB与平面EBC所成角的大小,
(3)求二面角A-BE-C的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)求直线AB与平面EBC所成角的大小,
(3)求二面角A-BE-C的大小.
您最近一年使用:0次
2019-01-09更新
|
496次组卷
|
8卷引用:2011-2012学年福建省三明市普通高中高二第一学期联合命题考试理科数学
(已下线)2011-2012学年福建省三明市普通高中高二第一学期联合命题考试理科数学上海市杨浦区上海理工大学附属中学2021-2022学年高一下学期期末数学试题(已下线)上海高二下学期期末真题精选(压轴60题35个考点专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)(已下线)高一下学期期末真题精选(压轴60题20个考点专练)-【满分全攻略】2022-2023学年高一数学下学期核心考点+重难点讲练与测试(人教A版2019必修第二册)(已下线)上海市高二下学期期末真题必刷01(易错题)--高二期末考点大串讲(沪教版2020选修)(已下线)河南省驻马店高中2010届高三一模(数学文)【校级联考】湖南省湘西自治州四校2018-2019学年高二上学期12月联考数学(理)试题福建省厦门市双十中学2018-2019学年高一下学期第一次月考数学试题
6 . 如图,在四棱锥
中,
平面
,且
,
,
是边
的中点.
![](https://img.xkw.com/dksih/QBM/2018/2/4/1875000224776192/1875603999318016/STEM/feb1db3519594f0facdbc24fc3866b94.png?resizew=237)
(1)求证:
平面
;
(2)若
是线段
上的动点(不含端点):问当
为何值时,二面角
余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.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/7bce559fceb4731f8d4323410075a22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cddc6170e2577f50f8eb8e7752112d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://img.xkw.com/dksih/QBM/2018/2/4/1875000224776192/1875603999318016/STEM/feb1db3519594f0facdbc24fc3866b94.png?resizew=237)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8783c76707e32c01c5d2548c00a92e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c915e0c39a3ead9e96649ef85c47de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd51b676a1cd83bb9569c6c5f5a02a8b.png)
您最近一年使用:0次
7 . 如图一,平面四边形
关于直线
对称,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eaa1c93a6352ed24e16f4e408b0209b.png)
.把
沿
折起(如图二),使二面角
的余弦值等于
.对于图二,完成以下各小题:
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/e84963bfd1b74f18a9aa928745a0e827.png)
(1)求
两点间的距离;
(2)证明:
平面
;
(3)求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/0f7bfee5ca5044b583d67d4e632aab8c.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/3593cd27529d4a778f8bbe018c880655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eaa1c93a6352ed24e16f4e408b0209b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/64b7fc6c3e724732bfb858cedc263757.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/f2562d105fb142938f660d4904bb024f.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/b13edf7b8558415fab0075da87022bde.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/9f3d40c7714f431395b1ef114b505bb9.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/e84963bfd1b74f18a9aa928745a0e827.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/05b3f99490b845119f3060061e60e03f.png)
(2)证明:
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/432e451fa98649ec8a19505abc9993d6.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/86d96dd5cc3f46d3bd4530ac6001234f.png)
(3)求直线
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/3593cd27529d4a778f8bbe018c880655.png)
![](https://img.xkw.com/dksih/QBM/2014/4/23/1571643584118784/1571643590000640/STEM/35adc6b18da446bca9fc0ba4d9a1d5b9.png)
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