1 . 如图,边长为2的正方形
中,点
是
的中点,点
是
的中点,将△
、△
分别沿
、
折起,使
、
两点重合于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/e7df6667-78af-4a3c-abee-ad72ea879468.png?resizew=381)
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646084b7f3902efa4c462ed67599265a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/e7df6667-78af-4a3c-abee-ad72ea879468.png?resizew=381)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cbc7f1e43c643372f6d68d33c92acb.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81dbaa7f82b99805eb4e47e3de199e8.png)
您最近一年使用:0次
2 . 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
|
1726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
3 . 如图,在三棱柱
中,四边形
是边长为4的正方形,平面
平面
,
,
.
(Ⅰ)求证:
平面
;
(Ⅱ)若点
是线段
的中点,请问在线段
是否存在点
,使得
面
?若存在,请说明点
的位置,若不存在,请说明理由;
(Ⅲ)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/37373d5e-5c8a-4bd1-9f27-697c1944b8fc.png?resizew=120)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(Ⅲ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2faf01e20ea1759f35ad567c4ed491fa.png)
您最近一年使用:0次
2016-12-03更新
|
1136次组卷
|
5卷引用:2014-2015学年湖南省浏阳、攸县、醴陵一中高一12月联考数学试卷
4 . 如图,AB是圆的直径,PA垂直圆所在的平面,C是圆上的点.
(1)求证:平面PAC⊥平面PBC;
(2)若AB=2,AC=1,PA=1,求二面角C-PB-A的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/0dfc328e-0a06-4056-aa33-179b44f6d9b4.png?resizew=155)
(1)求证:平面PAC⊥平面PBC;
(2)若AB=2,AC=1,PA=1,求二面角C-PB-A的余弦值.
您最近一年使用:0次
2016-12-02更新
|
1388次组卷
|
9卷引用:湖南省长沙市南雅中学2019-2020学年高二上学期第三次月考数学试题
湖南省长沙市南雅中学2019-2020学年高二上学期第三次月考数学试题(已下线)2014年高考数学(理)二轮复习专题能力测评5练习卷(已下线)2014年高考数学(文)二轮复习专题提升训练江苏专用16练习卷(已下线)2015届重庆市南开中学高三9月月考理科数学试卷(已下线)2015届重庆市南开中学高三9月月考理科数学试卷湖南省常德市石门县第二中学2018-2019学年高一下学期第一次月考数学试题湖北省宜昌市葛洲坝中学2018-2019学年高二上学期期中数学(理)试题第3章 空间向量与立体几何测试题 -2021-2022学年高二上学期数学北师大版(2019)选择性必修第一册甘肃省平凉市第二中学2022-2023学年高二下学期第二次月考数学试题
13-14高三上·山西忻州·期中
名校
5 . 如图,在四棱锥
中,底面
是边长为
的正方形,侧面 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
底面
,且
,设
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572675090644992/1572675096494080/STEM/77cddb6e-f670-43e4-bb28-09eba905f978.png?resizew=280)
(1)求证:
//平面
;
(2)求证:面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
平面
;
(3) 求二面角
的正切值.
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b7201f9eb7e7c10042c096e0c9f15c.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572675090644992/1572675096494080/STEM/77cddb6e-f670-43e4-bb28-09eba905f978.png?resizew=280)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
(3) 求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa431d661bf9f419e8ab713dd4a3c80.png)
您最近一年使用:0次
2016-12-04更新
|
660次组卷
|
5卷引用:2015-2016学年湖南省长沙市望城一中高一上学期期末数学试卷
2011·河北唐山·二模
名校
6 . 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
|
1137次组卷
|
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
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(已下线)2011届河北省唐山一中高三第二次调研考试数学理卷四川省南充市2019-2020学年高二(下)期末数学(理科)试题江苏省扬州市高邮市第一中学2020-2021学年高三上学期9月阶段性测试数学试题
11-12高三·甘肃兰州·期末
7 . 如图,已知正三棱柱ABC=A1B1C1的各棱长都是4,E是BC的中点,动点F在侧棱CC1上,且不与点C重合.
(1)当CF=1时,求证:EF⊥A1C;
(2)设二面角C﹣AF﹣E的大小为θ,求tanθ的最小值.
(1)当CF=1时,求证:EF⊥A1C;
(2)设二面角C﹣AF﹣E的大小为θ,求tanθ的最小值.
![](https://img.xkw.com/dksih/QBM/2014/5/30/1571743289548800/1571743295217664/STEM/f5366a5d-1b73-4a44-83e1-0a534c239eda.png?resizew=232)
您最近一年使用:0次
2016-12-03更新
|
2156次组卷
|
5卷引用:湖南省长沙市长郡中学2019-2020学年高二上学期入学考试数学试题