如图,在四棱锥
中,平面
平面
,已知底面
为梯形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790b04098e91a9ee77ac169a69f3cd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860da2b07c393d2e4a10873eb204e3c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/ce4b9adf-f20e-4235-a0bc-1a5ed5a8d8c6.png?resizew=158)
(1)证明:
;
(2)若
平面
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.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/790b04098e91a9ee77ac169a69f3cd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860da2b07c393d2e4a10873eb204e3c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/ce4b9adf-f20e-4235-a0bc-1a5ed5a8d8c6.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90197a948331e61db644266368017e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a109a776b4544c4cb705553d18982fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
更新时间:2023-05-07 17:30:10
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,三棱柱
中,四边形
是菱形,
平面
,二面角
为
,
.
![](https://img.xkw.com/dksih/QBM/2017/4/15/1666438192488448/1666877613006848/STEM/c8c41e356aca41f0892d0c351ff14ae7.png?resizew=250)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b1925ea2bd4f25794463d586a160b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dfca400092373db15198692100db3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b1925ea2bd4f25794463d586a160b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a4dea85d311efd64b0e3354ace082e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c279c8033acb94c3f91be2e05b0a6bf.png)
![](https://img.xkw.com/dksih/QBM/2017/4/15/1666438192488448/1666877613006848/STEM/c8c41e356aca41f0892d0c351ff14ae7.png?resizew=250)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803fa75db3ac3a26a41e347dc4165026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85709fa76f316e9f0b13ac297f3814c0.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0218542daefa15910d5111b27e71f5b3.png)
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【推荐2】在四棱锥
中,侧面
⊥底面
,底面
为直角梯形,
//
,
,
,
,
为
的中点.
(Ⅱ)若PC与AB所成角为
,求
的长;
(Ⅲ)在(Ⅱ)的条件下,求二面角F-BE-A的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639bec6242a4b3f7bfb4b7033a67328c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2682f3f3f0f72c893b99073bcac83ff2.png)
(Ⅱ)若PC与AB所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
(Ⅲ)在(Ⅱ)的条件下,求二面角F-BE-A的余弦值.
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解答题-问答题
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解题方法
【推荐1】如图所示,在三棱锥
中,E为P在底面
内的投影,且E为
的垂心.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/277755e6-3ede-4772-b587-ab02cc32d5e9.png?resizew=223)
(1)若F为C在平面
内的投影,证明:
;
(2)当三棱锥
为正三棱锥且
,PC与平面
所成角为
时,求点C到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/277755e6-3ede-4772-b587-ab02cc32d5e9.png?resizew=223)
(1)若F为C在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80406e8beb743b122bd7b021671c780.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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解答题-证明题
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【推荐2】如图所示,在五面体EF-ABCD中,底面ABCD为正方形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/2368d71a-7d59-457a-867c-64c143b717d2.png?resizew=205)
(1)求证:
;
(2)若
,点G为线段ED的中点,求直线DF与平面BAG所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b7f93bcf621d7a3abd80bb3e3d64a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/2368d71a-7d59-457a-867c-64c143b717d2.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3f58c56ea4208b11b56a343ea1de26.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09ddbc8ee56d8d755bc4e028c6b926d8.png)
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解题方法
【推荐3】如图,
为正三角形,
平面
,
,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2010/11/29/1569919404867584/1569919410159616/STEM/2bc9587a5c3b4b79bce6ede911e835c7.png?resizew=179)
求证:(1)
平面
;
(2)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477dc280b77f5640565dbc0ddf24460a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdd872d41982e7b50ed2aba66595f8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d379d3509a3ae0b9a97dd62cb0e5a05d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2010/11/29/1569919404867584/1569919410159616/STEM/2bc9587a5c3b4b79bce6ede911e835c7.png?resizew=179)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826bf6fa3706921b77ad0eb4fcc206bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f09ad78d4eccd1a9c9ccd3c4af79c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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解答题-证明题
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【推荐1】如图甲,在矩形
中,
,E为线段
的中点,将
沿直线
折起,使得平面
平面
,如图乙.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/171ffa1f-9c16-4dc4-8177-a18f0904ae52.png?resizew=331)
(1)求证:
平面
;
(2)线段
上是否存在一点H,使得二面角
的余弦值为
?若存在,请确定H点的位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100af11e6cb83b56437f2db7dadeb9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/171ffa1f-9c16-4dc4-8177-a18f0904ae52.png?resizew=331)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99e9a45187e2f0e0d3e502e43f24d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
您最近一年使用:0次
解答题-证明题
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解题方法
【推荐2】如图,在三棱柱
中,四边形
是边长为
的正方形,四边形
菱形,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/bf6a192e-552d-4019-867e-b5081b2015b8.png?resizew=194)
(1)求证:
;
(2)棱
(除两端点外)上点
,且二面角
余弦值为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfe69b939fd1c271747fe9d37ccdf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f4d9c3f1e496cc3fa3401ffaedd7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6c6d3d6ccbc4a2c0cf7e744c812070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171205fe4730ff07ced4805eea5dba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfe69b939fd1c271747fe9d37ccdf9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/bf6a192e-552d-4019-867e-b5081b2015b8.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf6f82f75b277fb932fb193184cfa47.png)
(2)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b7fa099ad4b400bdd7e0be10523374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8e7a9348fbaf7ec561c60df97f12c1.png)
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【推荐3】在如图①所示的长方形
中,
,
,
是
上的点且满足
,现将三角形
沿
翻折至平面
平面
(如图②),设平面
与平面
的交线为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/c45a746b-e62d-41e3-829b-87e406b4b47b.png?resizew=356)
(1)求二面角
的余弦值;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268d4721a3898235c268de4054981a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94150b3de8f92462598101d4adc17dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/c45a746b-e62d-41e3-829b-87e406b4b47b.png?resizew=356)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579f2a0c9ed5a754db77a751215533ac.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
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