如图,在四棱锥P﹣ABCD中,PA⊥底面ABCD,底面ABCD为直角梯形,
,AB⊥AD,且CD=2AB.
,求二面角P﹣CD﹣B的大小
(2)若E为线段PC上一点,试确定点E的位置,使得平面EBD⊥平面ABCD,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
(2)若E为线段PC上一点,试确定点E的位置,使得平面EBD⊥平面ABCD,并说明理由.
20-21高一下·全国·课后作业 查看更多[12]
北师大版 必修2 过关斩将 第一章 立体几何初步 §6 垂直关系 6.1 垂直关系的判定 第2课时 平面与平面垂直的判定四川省遂宁市射洪中学2021-2022学年高二上学期第一次月考数学理试题上海市华东师范大学附属枫泾中学2021-2022学年高二上学期期中数学试题(已下线)8.6 空间直线、平面的垂直(精讲)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)湖北省武汉市江夏实验高级中学2021-2022学年高二上学期10月月考数学试题(已下线)8.6.3平面与平面垂直(练案)-2021-2022学年高一数学同步备课 (人教A版2019 必修第二册)(已下线)第08讲 二面角(核心考点讲与练)-2022-2023学年高二数学考试满分全攻略(沪教版2020必修第三册)(已下线)上海高二上学期期中【夯实基础60题考点专练】(2)(已下线)上海高二上学期期中【易错、好题、压轴60题考点专练】(2)第13章《立体几何初步》单元达标高分突破必刷卷(培优版)-2022-2023学年高一数学《考点·题型·技巧》精讲与精练高分突破系列(苏教版2019必修第二册)陕西省西安市雁塔区第二中学2022-2023学年高一下学期第二次阶段性测评数学试题新疆生产建设兵团第二师八一中学2023-2024学年高二上学期期中考试数学(理科)试题
更新时间:2022-11-20 22:39:12
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】在斜三棱柱
中,O为底面正
的中心,
底面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/97989639-da79-40b8-8eff-2f52f99fdeb8.png?resizew=207)
(1)证明:平面
平面
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9d5815dc775d5a5810fff0b016a8d5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/97989639-da79-40b8-8eff-2f52f99fdeb8.png?resizew=207)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d40fad0bf738887305d76fb6c23a22c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a3323ef5e61d7467b097169d25c15e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面ABCD是矩形,
底面ABCD,
,且直线PD与底面ABCD所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/066a8e3b-6e94-4cb3-bf1b-e46cf3179ea0.png?resizew=172)
(1)求证:平面
平面PAC;
(2)若
,求二面角
的余弦值.
![](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/96127e45e2dd2494fccb1c0905951f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/066a8e3b-6e94-4cb3-bf1b-e46cf3179ea0.png?resizew=172)
(1)求证:平面
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(2)若
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解答题-问答题
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名校
解题方法
【推荐1】已知四棱锥
的底面
是棱长为2的菱形,
,若
,且
与平面
所成的角为
为
的中点,点
在线段
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
平面
.
;
(2)求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
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【推荐2】如图,在圆柱
中,AB是底面圆
的直径,CD是底面圆O的直径,已知圆O的半径为
,圆柱
的母线
,E为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864573997391872/2864643997515776/STEM/dbb0572e28d848bc9653b5643420e621.png?resizew=149)
(1)若
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平面ABE;
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的余弦值.
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(1)若
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e62ff9a1e516da21192977fcadbbb92.png)
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解答题-证明题
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适中
(0.65)
【推荐3】如图,已知在矩形
中,
,
,点
是边
的中点,
与
相交于点
,现将△
沿
折起,点
的位置记为
,此时
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/824f20886c834ccab119ef187a67a6e3.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/d7b971a1d70e44a1bf1489b1bb291584.png?resizew=244)
(Ⅰ)求证:
平面
;
(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/21ea52361458ce2e49ed0fe99d8e6c02.png)
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![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/d7b971a1d70e44a1bf1489b1bb291584.png?resizew=244)
(Ⅰ)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e536350bcd19804313eb04f43622943c.png)
(Ⅱ)求二面角
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