如图,已知四棱锥
的底面
是平行四边形,侧面
是等边三角形,
,
,
.请用空间向量的知识解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/7c4db902-d43d-4cf0-b1e1-c232a2bda0cb.png?resizew=171)
(1)求
与平面
所成角的大小;
(2)设Q为侧棱PD上一点,四边形
是过B,Q两点的截面,且
平面
,是否存在点Q,使得平面
与平面
夹角的余弦值为
?若存在,求
的值;若不存在,说明理由.
![](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/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1391573c30964b87ca3429bf67ae22aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccbd1316b9d1f0c1e71fd078deec61f6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/7c4db902-d43d-4cf0-b1e1-c232a2bda0cb.png?resizew=171)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)设Q为侧棱PD上一点,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea65669073300fd1a05649c0a99b41b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea65669073300fd1a05649c0a99b41b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea65669073300fd1a05649c0a99b41b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75af20fc9ce5b983212fb8a01276aa18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fcc76f6c07ce7e0bc75653ea0351526.png)
更新时间:2023-10-14 07:04:52
|
相似题推荐
解答题-证明题
|
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名校
解题方法
【推荐1】在四棱锥P-ABCD中,PD⊥平面ABCD,AB//DC,AB⊥AD,CD=AD=
AB=1,∠PAD=45°,E是PA的中点,G在线段AB上,且满足CG⊥BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8f108ec5-9642-477c-bb8b-bce5c67b1e78.png?resizew=176)
(1)求证:DE//平面PBC;
(2)求平面GPC与平面PBC夹角的余弦值.
(3)在线段PA上是否存在点H,使得GH与平面PGC所成角的正弦值是
,若存在,求出AH的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/8f108ec5-9642-477c-bb8b-bce5c67b1e78.png?resizew=176)
(1)求证:DE//平面PBC;
(2)求平面GPC与平面PBC夹角的余弦值.
(3)在线段PA上是否存在点H,使得GH与平面PGC所成角的正弦值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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【推荐2】如图,已知三棱柱
的侧棱与底面垂直,
,
,M,N分别是
,
的中点,点
在直线
上,且
.
取何值,总有
;
(2)当
取何值时,直线
与平面
所成角
最大?并求该角取最大值时的正切值;
(3)是否存在点
,使得平面
与平面
所成的二面角的正弦值为
,若存在,试确定点
的位置,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bdbf17f7bb0e70a339b4a1971d5c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597362da92c667625827a89c1c2e3dd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4ece75fe9b8555909be5a00d2b7af0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,在四棱锥
中,
为
中点,侧棱
,底面
为直角梯形,其中
,
,
平面
,
、
分别是线段
、
上的动点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/3fafa373-f351-486b-a2e1-5edac1600d8d.png?resizew=194)
(1)求证:
平面
;
(2)当三棱锥
的体积取最大值时,求
到平面
的距离;
(3)在(2)的条件下求
与平面
所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1328e05d150f86dbe18656662eaa8f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06da796ecac9d134225e1f456e413822.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/3fafa373-f351-486b-a2e1-5edac1600d8d.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b115316e0fcd2ef46a4dd383472996e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)在(2)的条件下求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图,
为圆柱底面圆周上三个不同的点,
分别为半圆柱的三条母线,且
是
的中点,
分别为
的中点.
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
平面
.
(2)若
是
上的动点(含弧的端点),求
与平面
所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1921b3559a5f73426f0d78e401ecc75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e7f10e0c8af2d0d02a685f6f19e329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a773f779cd892616a4ff68d3715f173.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/9dcbcca4-2b51-4993-aa32-884b622028af.png?resizew=90)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d9a7eb9395b5c7e9668be90d4d1dd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a3d5d669ac76a2ffb07da81d949adf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
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【推荐1】如图1,矩形ABCD中,
,将矩形ABCD折起,使点A与点C重合,折痕为EF,连接AF、CE,以AF和EF为折痕,将四边形ABFE折起,使点B落在线段FC上,将
向上折起,使平面DEC⊥平面FEC,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/3ce024cf-8a93-4a2d-87e6-5f9dd284a5d2.png?resizew=332)
(1)证明:平面ABE⊥平面EFC;
(2)连接BE、BD,求锐二面角A-BE-D的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff7c2b0b38b384699cac4df6e04cc6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/3ce024cf-8a93-4a2d-87e6-5f9dd284a5d2.png?resizew=332)
(1)证明:平面ABE⊥平面EFC;
(2)连接BE、BD,求锐二面角A-BE-D的正弦值.
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【推荐2】如图,已知矩形ABCD所在平面垂直直角梯形ABPE所在的平面于直线AB,且AB=BP=2,AD=AE=1,AE⊥AB,且AE∥BP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/62399625-1542-4eb9-80be-fd872b02e486.png?resizew=173)
(1)求平面PCD与平面ABPE所成的二面角的余弦值;
(2)在线段PD上是否存在一点N,使得直线BN与平面PCD所成角的正弦值等于
?若存在,试确定点N的位置;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/62399625-1542-4eb9-80be-fd872b02e486.png?resizew=173)
(1)求平面PCD与平面ABPE所成的二面角的余弦值;
(2)在线段PD上是否存在一点N,使得直线BN与平面PCD所成角的正弦值等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
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【推荐1】如图所示,在四棱锥
中,
平面
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/d32fd212-2871-4a54-a4c1-8675affcb3b8.png?resizew=154)
(1)求证
平面
;
(2)若点
为
的中点,线段
上是否存在一点
,使得平面
平面
?若存在,请确定
的位置;若不存在,请说明理由.
![](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/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78c83425fc00e6e6299a29efce209cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/d32fd212-2871-4a54-a4c1-8675affcb3b8.png?resizew=154)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071159cac13097ea0928285bc1be66d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26cf51c6441447f1ba4b15f6c6b20f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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【推荐2】如图,正三棱柱ABC-A1B1C1的底面边长是2,侧棱长是
,D是AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/950424d0-602f-4ae3-9e14-853fd47a0d8c.png?resizew=287)
(1).求证:B1C∥平面A1BD;
(2).求二面角A1-BD-A平面角的大小;
(3).在线段AA1上是否存在一点E,使得平面B1C1E⊥平面A1BD,若存在,求出AE的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/950424d0-602f-4ae3-9e14-853fd47a0d8c.png?resizew=287)
(1).求证:B1C∥平面A1BD;
(2).求二面角A1-BD-A平面角的大小;
(3).在线段AA1上是否存在一点E,使得平面B1C1E⊥平面A1BD,若存在,求出AE的长;若不存在,说明理由.
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【推荐3】在
中,
,
,
,D、E分别是AC、AB上的点,满足
且DE经过
的重心,将
沿DE折起到
的位置,使
,M是
的中点,如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a4f61106-d84b-4fdc-b913-87dcb9b24090.png?resizew=261)
(1)求证:
平面BCDE;
(2)求CM与平面
所成角的大小;
(3)在线段
上是否存在点N(N不与端点
、B重合),使平面CMN与平面DEN垂直?若存在,求出
与BN的比值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f5adc93dd8cbcf20573ec55bcbe09e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2fef4031c10abc18c8747af6b9a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/a4f61106-d84b-4fdc-b913-87dcb9b24090.png?resizew=261)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
(2)求CM与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a604466a9c8d10d557b3dfc43b547065.png)
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