如图,在四棱锥
中,
平面
,平面
平面
,
,
.
(1)证明:
;
(2)若
,
为
的中点,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9acd0d116dff2c723eb72cd915d4436d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fcb9ad5afe46c0799a279f873d2317.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/9fa1431a-065c-480c-aefc-59a3865566a2.png?resizew=233)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7f2ab75abc366639a5ca25f6f3d951.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
更新时间:2023-12-11 13:00:15
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,
,
,
,
平面
,M为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872481183645696/2878218847002624/STEM/0c2a0c65-f144-4258-ad72-ca02e043a4e4.png?resizew=232)
(1)证明:
平面
;
(2)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ac36c7ac328d903073739b8dcc0531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1049051d7a4b001fe585f22e09365b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7ac8d07ae5b3f442da71ac1cf359d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872481183645696/2878218847002624/STEM/0c2a0c65-f144-4258-ad72-ca02e043a4e4.png?resizew=232)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03203dd5ac79dd8c6707e4340773359.png)
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解题方法
【推荐2】如图,在直角梯形
中,
//
,
⊥
,
⊥
, 点
是
边的中点, 将△
沿
折起,使平面
⊥平面
,连接
,
,
, 得到如
图所示的空间几何体.
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681228012830720/1688826590248960/STEM/6082a0ef5a964ee393b2bd2b46f00539.png?resizew=47)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681228012830720/1688826590248960/STEM/2f79c1244da4455ea588f0f1d437a142.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681228012830720/1688826590248960/STEM/02773e20331b498180b51d2851d20d9a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2017/5/6/1681228012830720/1688826590248960/STEM/998aacd89bcc4c7590b02c9854b50e85.png?resizew=26)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
图所示的空间几何体.
(Ⅰ)求证:⊥平面
;
(Ⅱ)若,求点
到平面
的距离.
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解答题-证明题
|
适中
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名校
【推荐3】已知四棱锥S-ABCD的底面是正方形,
平面ABCD,求证:
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024389976571904/3026770058690560/STEM/02c1d5499b6a4dbd974742f69f1e85f6.png?resizew=207)
(1)
平面SAC;
(2)若
,求点C到平面SBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://img.xkw.com/dksih/QBM/2022/7/17/3024389976571904/3026770058690560/STEM/02c1d5499b6a4dbd974742f69f1e85f6.png?resizew=207)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/410f7a637b09213ab5481441b2f1082f.png)
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【推荐1】如图,四棱锥
中,侧面
底面ABCD,
,
,
,
,E,F分别是SC和AB的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
平面SAD;
(2)点P在棱SA上,当
与底面
所成角为
时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d1553f6806c1eee3b17b94d23f0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03766e254c3185d20f5f6d93fa6950d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3165e97ffc02c3d21a79f4e9f34ff368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42bcbc8c13e55d56ca7c483a778e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0cedfb76e95ae3371fad58069554ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/9ddbb321-3b90-4943-9976-dbfd3ebbb5f6.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)点P在棱SA上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abff725851bf24e35a4818af2e85c5c5.png)
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解题方法
【推荐2】如图,在四棱锥
中,
平面
,
,
,
,E为PB的中点,_________.从①
,②
平面
这两个条件中选一个,补充在上面问题的横线中,并完成解答.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/520e7052-8af3-4b13-af77-6549a04bc31f.png?resizew=112)
(1)求证:四边形ABCD是直角梯形;
(2)求直线AE与平面PCD所成角的大小.
注:如果选择多个条件分别解答,按第一个解答计分.
![](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/52a923784f083b7f4777891afe06b44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1720da6d65e7fa854d98322d3864240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f8b463fcecf0a757f386db56e074d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/520e7052-8af3-4b13-af77-6549a04bc31f.png?resizew=112)
(1)求证:四边形ABCD是直角梯形;
(2)求直线AE与平面PCD所成角的大小.
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
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【推荐3】如图,在四棱锥
中,
平面
,底面
是直角梯形,
,
,且
,
,
,
,
为
的中点,
为
上一点.
(1)若
为
中点,求证:
平面
;
(2)线段
上是否存在一点
,使得直线
与平面
所成角的正弦值为
,若存在,求出
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/706349cb-41a1-42e5-a501-8b6170747ab2.png?resizew=174)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4977ead188a981366d7487cca3532da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241a37fb1eff68a7133822b1b52d627e.png)
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