如图所示的几何体由一个半圆锥和一个三棱锥组合而成,两个锥体的底面在同一平面内,BC是半圆锥底面的直径,D在底面半圆弧上,且
,△ABC是等边三角形.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967074017107968/2968139780636672/STEM/c697937a-3aea-4cca-a8ef-a7f82d0c5f46.png?resizew=155)
(1)证明:
平面SAC;
(2)若BC=2,
,求直线CD与平面SAB所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f2eac045b24557bcec085322c5a0c9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967074017107968/2968139780636672/STEM/c697937a-3aea-4cca-a8ef-a7f82d0c5f46.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c44836da3b92c32f28a3065986a0cf8.png)
(2)若BC=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978285f673cd222a5bc4d5be3b4f4785.png)
2022·海南海口·模拟预测 查看更多[2]
更新时间:2022-04-28 22:38:45
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解答题-证明题
|
适中
(0.65)
【推荐1】如图1,在Rt△ABC中,∠ABC=90°,D为AC中点,
于
(不同于点
),延长AE交BC于F,将△ABD沿BD折起,得到三棱锥
,如图2所示.
(1)若M是FC的中点,求证:直线
//平面
;
(2)求证:BD⊥
;
(3)若平面
平面
,试判断直线
与直线CD能否垂直?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c18aba9681a8475968248764d4c3a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/eaa573b4-dfc5-4eaa-870b-bc8ee17798d0.png?resizew=161)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/85066149-564f-4e3d-a4c6-c10566539fd2.png?resizew=165)
(1)若M是FC的中点,求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
(2)求证:BD⊥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
(3)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba0fbd88fdb064072eedd136e9cb41ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
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解答题-证明题
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名校
解题方法
【推荐2】如图,在三棱锥
中,
平面
,
,
,
分别为
,
的中点.求证
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/4f49693e-bf73-4e62-be0c-6d19e8a48c29.png?resizew=160)
(1)
平面
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/4f49693e-bf73-4e62-be0c-6d19e8a48c29.png?resizew=160)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9874eca4abea481fa84eb772a920f9c7.png)
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解答题-证明题
|
适中
(0.65)
【推荐3】已知四棱锥
中,
,
,
,侧面
底面
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959671530758144/2961367864090624/STEM/35180a0fc97e4e76b1d3bf9e756c18c9.png?resizew=307)
(1)设点
为
上的动点,求证:四面体
的体积为定值;
(2)求平面
和平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32d58e3c5899425827fd5b29f564c17.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/93edc7bb513f40a89173121c8570cd65.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959671530758144/2961367864090624/STEM/35180a0fc97e4e76b1d3bf9e756c18c9.png?resizew=307)
(1)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7bce6eba5d07a34f24c5370c580ac7.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
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解答题-证明题
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适中
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【推荐1】如图,矩形ABCD中,
,
,E、F分别为CD、AB边上的点,且
,
,将
沿BE折起至
位置(如图所示),连结AP、EF、PF,其中
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/a2b58300-a388-49c1-904a-e6c75eef6e67.png?resizew=332)
(1)求证:
平面ABED.
(2)求直线AP与平面PEF所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64e0206b1814c35cc96bd2b6b12239a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ddf4d708c829ece5bef03f0d9517df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/a2b58300-a388-49c1-904a-e6c75eef6e67.png?resizew=332)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce49710609f7bffc36441dc5c2f7c2ea.png)
(2)求直线AP与平面PEF所成角的正弦值.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在直三棱柱
中,
,D,E分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/27/2887212414181376/2924073101574144/STEM/fcf2c1ae-923d-44a8-81cb-24a31668b4d6.png?resizew=169)
(1)求证:
平面
;
(2)若
,二面角
的大小为
,求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b253f55d19e2cc6602c5f4897c84e54.png)
![](https://img.xkw.com/dksih/QBM/2021/12/27/2887212414181376/2924073101574144/STEM/fcf2c1ae-923d-44a8-81cb-24a31668b4d6.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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