如图,在四棱锥
中,平面
平面
,
,
是
的中点,
![](https://img.xkw.com/dksih/QBM/2017/11/24/1823950705262592/1826147410853888/STEM/961de5db9a9348f4938c129522b1a57d.png?resizew=257)
(1)求证:
平面
;
(2)求
与平面
所成的角的正切值;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b36d3be6a201624b241e9b9ab00bda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6269b1c743250bbb638f80cc0ee34b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2017/11/24/1823950705262592/1826147410853888/STEM/961de5db9a9348f4938c129522b1a57d.png?resizew=257)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f46276f25c78bab48c1f9447a2a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c7a937699f989b685f285041434000.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479b251fdb01bae6d16abb7f2d694a7.png)
更新时间:2016-12-03 15:31:47
|
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解答题-证明题
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【推荐1】刍甍(chú méng)是中国古代数学书中提到的一种几何体,《九章算术》中对其有记载:“下有袤有广,而上有袤无广”,可翻译为:“底面有长有宽为矩形,顶部只有长没有宽为一条棱.”,如图,在刍甍
中,四边形ABCD是正方形,平面
和平面
交于
.
;
(2)若平面
平面ABCD,
,
,
,
,求平面
和平面
所成角余弦值的绝对值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ba3f676fda6a2aaaa55c9f32874a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666734423f1818d76a74f171b7420b68.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c1acdd27cebb11e0266464b03b3afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/869dbfaf24d441c4ce3a2b8db86cd2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678988261e6fd7c4f1199c0204a8045d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ba3f676fda6a2aaaa55c9f32874a51.png)
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解题方法
【推荐2】如图,在多面体
中,底面
为平行四边形,
,矩形
所在平面与底面
垂直,
为
的中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
平面
;
(2)若平面
与平面
夹角的余弦值为
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f066f86a3df01f4231ff63986d905c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
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解题方法
【推荐1】如图,在直三棱柱
中,
是
的中点.
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/982b0f98-9fba-4c3b-8d75-3ef8fa478177.png?resizew=137)
(Ⅰ)求直线
与平面
所成角的正弦值;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](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/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/982b0f98-9fba-4c3b-8d75-3ef8fa478177.png?resizew=137)
(Ⅰ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91441b6a208013fa5e8ddf7c8cd1f43d.png)
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【推荐2】如图,四棱锥
的底面为正方形,
底面
,
,
,
分别为
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647478988939264/2650671998828544/STEM/81fdab04684d465a941a912c96d506f9.png?resizew=147)
(1)求证:
平面
;
(2)若
,求直线
与平面
所成线面角的正弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647478988939264/2650671998828544/STEM/81fdab04684d465a941a912c96d506f9.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbbb73ad3e3e6a13b605527c00a8c56.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbbb73ad3e3e6a13b605527c00a8c56.png)
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【推荐3】如图,在四棱锥P-ABCD中,底面ABCD是边长为2的正方形,点E、F分别是棱PC和PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/ab7f1bf1-a317-49e9-811b-5775a603632a.png?resizew=195)
(1)求证:EF
平面PAB;
(2)若AP=PD=2,平面PAD⊥平面ABCD,求直线PB和平面ABCD所成角的正切值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/ab7f1bf1-a317-49e9-811b-5775a603632a.png?resizew=195)
(1)求证:EF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
(2)若AP=PD=2,平面PAD⊥平面ABCD,求直线PB和平面ABCD所成角的正切值.
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【推荐1】在三棱锥
中,
和
是边长为
的等边三角形,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/d8d8b988-a5d7-4bc5-a000-8191307e288a.png?resizew=167)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8c7c8c8702adfbd6bcacc94a6bc661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe964aa3574061970c9c8066df21c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/d8d8b988-a5d7-4bc5-a000-8191307e288a.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6072ec6dfc0203cabb1fe289a5ddc8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
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【推荐2】如图,四面体ABCD中,△ABC是以BC为斜边的等腰直角三角形,△BCD是边长为2的正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/ea9c80f7-e807-4c94-8083-68bd9e6d7967.png?resizew=175)
(Ⅰ)当AD为多长时,
?
(Ⅱ)当二面角B﹣AC﹣D为
时,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/ea9c80f7-e807-4c94-8083-68bd9e6d7967.png?resizew=175)
(Ⅰ)当AD为多长时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111e7457054daa5c779029f45f969d9f.png)
(Ⅱ)当二面角B﹣AC﹣D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a203d96e08717eb480e9ae4bcc35c4.png)
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