名校
1 . 已知等腰直角三角形
,
,
分别是
的中点,沿
将
折起(如图),连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/a30ce8c9-d538-4a3a-be57-50410019ea36.png?resizew=350)
(Ⅰ)设点
为
中点,求证:
面
;
(Ⅱ)设
为
的中点,当
折成二面角
为
时,求
与面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f149e83812e72efd7dd3dfc78d0134ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.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/5881068127a39caf319492b4177204f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/a30ce8c9-d538-4a3a-be57-50410019ea36.png?resizew=350)
(Ⅰ)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b301c74bfd4824215e12ce4504cfec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2020-04-20更新
|
681次组卷
|
3卷引用:安徽省阜阳市太和第一中学2020-2021学年高二(奥赛班)上学期期中数学试题
2 . 如图所示,正方形
折成直二面角
,则
与面
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c78a43fd-049f-4501-811a-b77971b3d534.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354a3c0d43f12fe4e5f1b5e224620a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb5672ffc5efe753f38a6191f8d2f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c78a43fd-049f-4501-811a-b77971b3d534.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 如图,四棱锥
中,底面
为菱形,
,平面
底面
,
是
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/e7ef9eaa-4172-42a5-b074-d0347e75fe38.png?resizew=149)
(1)证明:平面
平面
;
(2)若直线
平面
,且
,求直线
与平面
所成角的大小.
![](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/98e624e6ee68b796f70f9d35e78a8aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/e7ef9eaa-4172-42a5-b074-d0347e75fe38.png?resizew=149)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ced8225ff27c8e3e1897b8629312d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2020-03-09更新
|
140次组卷
|
2卷引用:安徽省合肥市第十一中学2020-2021学年高二上学期期中数学(文)试题
4 . 如图,在四棱锥
中,
,
,
,
,
,
,
平面
,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/b14b0fe7-f7ae-43ff-a461-27034794e584.png?resizew=207)
(1)求证:平面
平面
;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923718ac7b296dd2c3b5b1d8ea0c3b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83c3f76bc7569c3c088da98bb3b2c50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/b14b0fe7-f7ae-43ff-a461-27034794e584.png?resizew=207)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e57d85dcecc700a41c1950733e45272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
您最近一年使用:0次
2020-03-06更新
|
142次组卷
|
2卷引用:安徽省滁州市定远县民族中学2021-2022学年高三下学期期中考试数学(理)试题
名校
解题方法
5 . 如图,三棱锥
中,
平面
,
,
,点
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/2/20/2403306018299904/2404659340894208/STEM/3bd70ddb-c52d-4f40-a705-8bdfa348616d.png)
(1)求证:
平面
;
(2)
是线段
上的点,且
平面
.
①确定点
的位置;
②求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a30b62bac36c4761cf9441873e309250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/2/20/2403306018299904/2404659340894208/STEM/3bd70ddb-c52d-4f40-a705-8bdfa348616d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d47802d866e5cf64808fb34f9af601.png)
①确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2020-02-22更新
|
669次组卷
|
2卷引用:安徽省合肥市庐阳区第一中学2019-2020学年高二上学期期中数学(理)试题
名校
解题方法
6 . 在正方体
中.
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397643038875648/2398229448925184/STEM/15f11493da76443fb5404490140ddda4.png?resizew=198)
(1)求证:
;
(2)
是
中点时,求直线
与面
所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397643038875648/2398229448925184/STEM/15f11493da76443fb5404490140ddda4.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f217a2438de689a0476f63e8d8f380c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ef601ca1f9c4c031adab4ffed297f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33c6587f6e6ec7e400046516bb2c015.png)
您最近一年使用:0次
2020-02-13更新
|
219次组卷
|
2卷引用:安徽省安庆市怀宁县第二中学2020-2021学年高二上学期期中数学(文)试题
2011·海南海口·一模
名校
解题方法
7 . 如图,在三棱柱
中,侧棱垂直于底面,底面是边长为2的正三角形,侧棱长为3,则
与平面
所成的角为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/876f7f16-297e-4ff6-a174-2367f7f4ddae.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/876f7f16-297e-4ff6-a174-2367f7f4ddae.png?resizew=162)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-09-08更新
|
351次组卷
|
9卷引用:安徽省合肥市第六中学2020-2021学年高二上学期期中数学(理)试题
安徽省合肥市第六中学2020-2021学年高二上学期期中数学(理)试题【市级联考】河北省遵化市2018-2019学年高二上学期期中考试数学试题安徽省合肥市第六中学2020-2021学年高二上学期期中理科数学试题(已下线)2011届海南省海口市高三高考调研考试理科数学(已下线)2014年高考数学(理)二轮复习专题提升训练优化重组卷4练习卷2015届内蒙古一机一中高三12月月考理科数学试卷【全国校级联考】石家庄四县七校2017-2018学年第二学期期末教学质量检测高一数学安徽省芜湖市华星学校2020-2021学年高二下学期第一次月考理科数学试题北京一零一中学2022-2023学年高二上学期数学统练试题(1)
名校
8 . 如图,在三棱柱
中,
平面
,
分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450771658326016/2452885264826368/STEM/10b80da654e641298b173c66834f5ede.png?resizew=185)
(1)求证:
平面
;
(2)若
,求直线
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4a70c6802a812c7118fa85eb7170a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450771658326016/2452885264826368/STEM/10b80da654e641298b173c66834f5ede.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e4d2401dc178b704fe7c22fb222d67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7945c3a6113cdee255b503c55850b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
9 . 如图,在四棱锥
中,
底面
,
,
,
,
,点
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/525c1b98-6bef-4ea8-ba67-c31eacf13f0f.png?resizew=187)
(1)证明:
面
;
(2)证明:面
面
;
(3)求直线
与面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba814113887c21637c1954f244812f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/525c1b98-6bef-4ea8-ba67-c31eacf13f0f.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)证明:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2019-12-12更新
|
898次组卷
|
3卷引用:安徽省芜湖市第一中学2019-2020学年高二上学期期中考试数学(文)试题
名校
10 . 将正方形
沿对角线
折成直二面角
,有如下三个结论.
①
;②
是等边三角形;③
与平面
成
的角.
说法正确的命题序号是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
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说法正确的命题序号是
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2019-05-28更新
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3卷引用:安徽省安庆市怀宁县第二中学2020-2021学年高二上学期期中数学(理)试题
安徽省安庆市怀宁县第二中学2020-2021学年高二上学期期中数学(理)试题安徽省淮北师范大学附属实验中学2018-2019学年高一下学期第一次月考数学试题(已下线)狂刷37 空间角与距离-学易试题君之小题狂刷2020年高考数学(理)