如图所示,已知
中,
,且
,现将
沿BC翻折到
,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/f09d95aa-931b-44c6-92f7-b6c12621c71e.png?resizew=146)
(1)求证:
;
(2)若E为边CD的中点,求直线AE与平面ABC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc223bc59d4c5b1c99f811e4bded9783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7f278de55bd20ebbebf93b2bffa77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9b12026eb766b2066b95cdc41220a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/f09d95aa-931b-44c6-92f7-b6c12621c71e.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)若E为边CD的中点,求直线AE与平面ABC所成角的正弦值.
2023·北京·模拟预测 查看更多[6]
北京市清华大学THUSSAT2023届高三上学期12月诊断性测试数学(理)试题中学生标准学术能力诊断性测试2022-2023学年上学期12月测试(新课改版)数学试题(已下线)湖南省株洲市2023届高三下学期一模数学试题变式题17-22(已下线)专题20 空间几何解答题(文科)-1(已下线)专题8.15 空间中线面的位置关系大题专项训练(30道)-2022-2023学年高一数学举一反三系列(人教A版2019必修第二册)(已下线)10.3 直线与平面间的位置关系(第3课时)(七大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020必修第三册)
更新时间:2023-02-22 17:51:34
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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,在正方体
中,E、F、G分别为
、
、
的中点,O为
与
的交点,
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(2)求直线
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf511390456b2ef0370e326b6d76fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204c3e92cf8f06e84702920d447b72f4.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204c3e92cf8f06e84702920d447b72f4.png)
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名校
【推荐2】如图,在矩形
中,
是
的中点,以
为折痕将
向上折起,使
为
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/9/15/2808544331800576/2809189649989632/STEM/7d2d2eb9f37b4aa5aaec141971b7d71d.png?resizew=450)
(Ⅰ)求证:
;
(Ⅱ)求直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff1f918c93a963e2db51d99eb1d75c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e782c11b1fdb43c1e9b0175ff6ce47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(Ⅰ)求证:
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(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae9bd3db15b3c5062240b4438fe6476.png)
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名校
【推荐3】如图所示,已知
与
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,
,
,
,点
分别在边
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将
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/240300b0-4447-4b57-8d61-45c3f17fa359.png?resizew=194)
(1)证明
.
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbeb8ebe198bb9ef37b5c57027b28821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eb0c11e4b7aa9030a6691aee35eed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd3355d3bee7e168af3bec0662b7dd8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/240300b0-4447-4b57-8d61-45c3f17fa359.png?resizew=194)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b182ff664d8ed9d0c518dbbf98ef10f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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解题方法
【推荐1】已知
,直线
与平面
所成的角为
,直线
与平面
所成的角为
,
,且斜线段
在平面
内的射影相互垂直,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b6de90bb936cdb09629123100145d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】(注意:在试题卷上作答无效)
如图,直角△BCD所在的平面垂直于正△ABC所在的平面,PA⊥平面ABC,
,E为DB的中点.
(Ⅰ)证明:AE⊥BC;
(Ⅱ)若点
是线段
上的动点,设平面
与平面
所成的平面角大小为
,当
在
内取值时,求直线PF与平面DBC所成的角的范围.
如图,直角△BCD所在的平面垂直于正△ABC所在的平面,PA⊥平面ABC,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd0a1e0b93cedf080012ca1419908fc.png)
(Ⅰ)证明:AE⊥BC;
![](https://img.xkw.com/dksih/QBM/2010/8/10/1569811319152640/1569811324067840/STEM/b9ff58d5-ba9c-4608-9338-d5521d5bc79c.png?resizew=171)
(Ⅱ)若点
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