如图,四棱锥
的底面
是边长为2的菱形,
,E为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074790710706176/3075522167324672/STEM/f4a018d195b145d4b56b8cbbecdff09d.png?resizew=252)
(1)证明:
平面
;
(2)求三棱锥
的体积;
(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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a3ccc06bd57e73c7fb9c22e242d0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2022/9/26/3074790710706176/3075522167324672/STEM/f4a018d195b145d4b56b8cbbecdff09d.png?resizew=252)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb178784aa857d4d4683e650273f054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95e78927443bbadb5bf60f1c836ea24.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
21-22高一下·黑龙江牡丹江·期末 查看更多[5]
黑龙江省牡丹江市第二高级中学2021-2022学年高一下学期期末考试数学试题(已下线)第八章 立体几何初步 讲核心 02(已下线)空间直线、平面的垂直(已下线)8.6.2 空间角与空间距离(精练)-2022-2023学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)黄金卷03
更新时间:2022-09-27 15:48:46
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】直三棱柱
中,
为正方形,
,
,
为棱
上任意一点,点
、
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/b695deef-adb7-4abd-ba60-47e8b78cf131.png?resizew=184)
(1)求证:
平面
;
(2)当点
为
中点时,求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/b695deef-adb7-4abd-ba60-47e8b78cf131.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe67036b4671b5d2a5c55b48c4d3bb9.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
是梯形,
,
,
,
为等边三角形,
为棱
的中点.
(1)证明:
平面
;
(2)当
=
时,求证:平面
⊥平面
,并求点
与到平面
的距离.
![](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/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8c12a6be7d9ec81631aca2c2b5074a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.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/editorImg/2023/5/25/3aa58be3-f1be-40a5-83f7-df471a698468.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.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/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐1】如图,在圆锥中,
、
为底面圆的两条直径,
,且
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373504508461056/2373612328845312/STEM/d0cea48969064f098ca24001c74d0c00.png?resizew=111)
(1)求证:
平面
;
(2)求该圆锥的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a5ed40e239098309bb3c9a5ad28489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c0bab321c59938ac0559e269692df4.png)
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373504508461056/2373612328845312/STEM/d0cea48969064f098ca24001c74d0c00.png?resizew=111)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9428c4a6a25d360a036aaf0a92e40988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求该圆锥的表面积.
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解答题-问答题
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解题方法
【推荐2】如图所示,在三棱柱ABC﹣A1B1C1中,平面ACC1A1⊥平面ABC,AA1⊥AC,D,D1分别为AC,A1C1的中点且AD=AA1,DB⊥AC.
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730688104423424/2736937453625344/STEM/513e3c4e-cf8c-49fa-8f01-bc8a4b1409c3.png?resizew=246)
(1)在棱AA1上找一点M,使得
平面
,并说明理由;
(2)若
,证明:
.
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730688104423424/2736937453625344/STEM/513e3c4e-cf8c-49fa-8f01-bc8a4b1409c3.png?resizew=246)
(1)在棱AA1上找一点M,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d28074ee5af1441242700388b3a9c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294ffdba16ae69fd03b13959d682aba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1191e9cc4654cc68561952630692dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbebe6674d5c4f9f6dda552648bfab9.png)
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【推荐3】
是正三角形,线段
和
都垂直于平面
.设
,
,且F为
的中点,如图.
(1)求证:
平面
;
(2)求证:
;
(3)求平面
与平面
所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3b1722b100297f2fa8fad62423149d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede69346d90f2c2c7d738d90c6aa60a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/aa72c9c8-00af-4424-93b5-63c8171293c4.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2b5cfae407016cad45bbdefea05833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39b13d187b25461d85a3b8d10c7b678.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐1】在如图所示的多面体中,四边形
是矩形,梯形
为直角梯形,平面
平面
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/13/2440821363081216/2441230623858688/STEM/184e9d2ade2449ccb2bdf9d50d263cf1.png?resizew=245)
(1)求证:
平面
.
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f46b357e543eb2e895d0ea4742f4546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a466e92d116fd039bd7ba909e130f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403e4c9c38f72e76ef42284312c516c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f46b357e543eb2e895d0ea4742f4546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3345a95aa2230048456c733f26ddb83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59aa01b9eea020c68c57abdb465bab34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5acf32eaaf9cc1fb33cf1230fccfefb1.png)
![](https://img.xkw.com/dksih/QBM/2020/4/13/2440821363081216/2441230623858688/STEM/184e9d2ade2449ccb2bdf9d50d263cf1.png?resizew=245)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88d863bbe0a300e8c2f464574c4f5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f8c7b6766f0581fcd1ecd332afcfae.png)
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适中
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【推荐2】已知三棱柱
中,
,侧面
底面
,
是
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/1d25476c-8cad-4683-b6f4-580c6d6c4fa6.png?resizew=158)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/781a4e591f63f86ea9f8a4998f2229b5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/1d25476c-8cad-4683-b6f4-580c6d6c4fa6.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f25c5543b39190dc2499aa66f939659.png)
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【推荐1】三棱锥被平行于底面ABC的平面所截得的几何体如图所示,截面为A1B1C1,∠BAC=90°,A1A⊥平面ABC,A1A=
,AB=
,AC=2,A1C1=1,
.
(1)证明:BC
A1D;
(2)求二面角A-CC1-B的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0870515b612ef842f01f3b5eeca220b5.png)
(1)证明:BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)求二面角A-CC1-B的余弦值.
![](https://img.xkw.com/dksih/QBM/2018/3/6/1896189515472896/1903293946019840/STEM/d95a5686-1951-4424-b8ac-4229e9b94db3.png)
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【推荐2】如图,在四棱锥
中,
,
,
,
,
是正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/40bae12d-a9f4-481a-91e4-10875d96a39d.png?resizew=177)
(1)求证:
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c9d5c0b9d7b7cf3e14f56bc3b4ac2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6914d401b0e7099dbea8ebdd5052ee7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/40bae12d-a9f4-481a-91e4-10875d96a39d.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
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