如图,在四棱锥
中,
底面ABCD,
,
,
,
,E为PD的中点,F在线段PC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/37caaeb3-2d7e-4b18-aeac-6973fac607ee.png?resizew=191)
(1)求证:
平面PCD;
(2)求CB与平面AEF所成角
的正弦值.
(3)求点C到平面AEF的距离.
![](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/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da59b318eb096c1effa251d0ae6212ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f501d3913a937f93c66620ff4aad846e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/37caaeb3-2d7e-4b18-aeac-6973fac607ee.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
(2)求CB与平面AEF所成角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(3)求点C到平面AEF的距离.
更新时间:2023-11-03 08:57:16
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相似题推荐
解答题-问答题
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解题方法
【推荐1】如图,四面体
中,
,
,
,E为AC的中点,且平面
平面
,若
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/5ea340a5-a3ad-445d-b869-e142fc47f8de.png?resizew=176)
(1)证明:
;
(2)点
在
上,当
的面积最小时,求
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2aca1bdb9459855415e292e73de50ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ff58f671a287701011a1b31e67e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c646c683fbe522edb7ea54fd3ad873d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/5ea340a5-a3ad-445d-b869-e142fc47f8de.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐2】如图所示,在四棱锥S ABCD中,平面SAD⊥平面ABCD.四边形ABCD为正方形,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/388048fc-0253-4619-93d4-6d78a40677d9.png?resizew=171)
(1)求证:CD⊥平面SAD.
(2)若SA=SD,点M为BC的中点,在棱SC上是否存在点N,使得平面DMN⊥平面ABCD?若存在,请说明其位置,并加以证明;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/388048fc-0253-4619-93d4-6d78a40677d9.png?resizew=171)
(1)求证:CD⊥平面SAD.
(2)若SA=SD,点M为BC的中点,在棱SC上是否存在点N,使得平面DMN⊥平面ABCD?若存在,请说明其位置,并加以证明;若不存在,请说明理由.
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【推荐3】如图,在直三棱柱
中,底面三角形
为直角三角形,其中
,
,
,
,
,
分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/874424e2-76ab-4747-8bff-c13ed965b398.png?resizew=163)
(1)求证:
平面
;
(2)当点
在线段
上移动时,求直线
与平面
所成角正弦的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686e0e87d8dc1da1a2a1631719e9c61b.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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/874424e2-76ab-4747-8bff-c13ed965b398.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00c25c4259d935d6e6fabe5c3fc1f43c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae80f09dae8acbe1e5e27bd5c4d8164.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4df5845bc756fe9d1a8af6bb56fcc36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
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【推荐1】如图,在正方体ABCD-A1B1C1D1中.
(I)求证:AC⊥BD1;
(Ⅱ)是否存在直线与直线 AA1,CC1,BD1都相交?若存在,请你在图中画出两条满足条件的直线(不必说明画法及理由);若不存在,请说明理由.
(I)求证:AC⊥BD1;
(Ⅱ)是否存在直线与直线 AA1,CC1,BD1都相交?若存在,请你在图中画出两条满足条件的直线(不必说明画法及理由);若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/653e298c-e397-4f67-8063-e544cf427405.png?resizew=158)
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【推荐2】如图,在三棱台
中,已知平面
平面
,
,
,四边形
是等腰梯形,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634689290518528/2635925608939520/STEM/0e924d18c3e646efbeb3d0fa2bfdb567.png?resizew=210)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66cd105d08d68647b5629e88e7af26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbacec71b7846b1bfb88dd7e65fb4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfe69b939fd1c271747fe9d37ccdf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d7164e4a255066748348e3f33a5b97.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/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634689290518528/2635925608939520/STEM/0e924d18c3e646efbeb3d0fa2bfdb567.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18ebcf0dd660161ede5f8e51307fbd7.png)
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【推荐1】如图所示的几何体中,四边形ABCD为矩形,
平面ABCD,
,
,
,点P为棱DF的中点.
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851837236076544/2856679565885440/STEM/b45af28355ad40acb6e2319b7f89244c.png?resizew=287)
(1)求证:
平面APC;
(2)求直线DE与平面BCF所成角的正弦值;
(3)求平面ACP与平面BCF的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41d3f7d55fcbaebc4e2450ac63a3dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6af63b704381bec4591c3af519b126d6.png)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851837236076544/2856679565885440/STEM/b45af28355ad40acb6e2319b7f89244c.png?resizew=287)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
(2)求直线DE与平面BCF所成角的正弦值;
(3)求平面ACP与平面BCF的夹角的余弦值.
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【推荐2】如图,已知三棱锥
的侧棱
两两垂直,且
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2019/3/30/2171535690563584/2172258140790784/STEM/d07e230e25194cf282749bc2dba0d979.png?resizew=211)
求异面直线
与
所成角的余弦值;
求直线
和平面
的所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca03d21059996f815c5e377ddf127368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c83984c62d390c6b30efa5d4e560de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b878adb80a03376081361b0512b6f8e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034150226c5cd24066a4a4faed2137e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://img.xkw.com/dksih/QBM/2019/3/30/2171535690563584/2172258140790784/STEM/d07e230e25194cf282749bc2dba0d979.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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解题方法
【推荐1】在直三棱柱
中,
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/ffbf31c6-3e48-4e9b-83e9-9ee867196f60.png?resizew=114)
(1)求异面直线
所成角的余弦值;
(2)求直线
与平面
所成角的正弦值;
(3)求直线
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5448308469294d862f2c761ace330aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/ffbf31c6-3e48-4e9b-83e9-9ee867196f60.png?resizew=114)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881a85d9088d781ba1bec7ab3e02de49.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ce0eeb7a6d6c7806cf2352b9fe15c2.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ce0eeb7a6d6c7806cf2352b9fe15c2.png)
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【推荐2】在长方体
中,
,过
三点的平面截去长方体的一个角后,得到如图所示的几何体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e2053f36-731e-49f4-9a18-376bc547016c.png?resizew=157)
(1)若
的中为
,求异面直线
与
所成角的大小(结果用反三角函数值表示);
(2)求点
到平面
的距离
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10960e28df00dd6025b679920642b0c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98683f96b0d1ae96ae772e1088f5042b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52eab6de89f4d4e69650e94e0968744.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e2053f36-731e-49f4-9a18-376bc547016c.png?resizew=157)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b3920d41295bb20983cd9945cb18f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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