名校
解题方法
1 . 用文具盒中的两块直角三角板(
直角三角形和
直角三角形)绕着公共斜边翻折成
的二面角,如图
和
,
,
,
,
,将
翻折到
,使二面角
成
,
为边
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/fa55fa66-60f8-40e4-9104-56ad505dd9fa.png?resizew=351)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035bb7882c582c2de36cae3d772ec63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97fc2087ec10f3de2f253044992eac52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42798067d911f96e5784cb138319c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719103f93166bab4828257608e641a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd93fd4788cbe4ae8ea1c783633f127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297f713ddbcc4578e73c8afe3a52abfa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/fa55fa66-60f8-40e4-9104-56ad505dd9fa.png?resizew=351)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf447e844152545c47a9f67fc3248c0.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719103f93166bab4828257608e641a9a.png)
您最近一年使用:0次
2022-09-07更新
|
636次组卷
|
2卷引用:浙江省名校协作体2022-2023学年高二上学期开学考试数学试题
2 . 已知梯形
,现将梯形沿对角线
向上折叠,连接
,问:
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986381346414592/2986469922070528/STEM/3206762a-48bc-4b44-ba5a-031fa02e6e8a.png?resizew=185)
(1)若折叠前
不垂直于
,则在折叠过程中是否能使
?请给出证明;
(2)若梯形
为等腰梯形,
,折叠前
,当折叠至面
垂直于面
时,二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafac61dc0ff84d57596341d673a5703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986381346414592/2986469922070528/STEM/3206762a-48bc-4b44-ba5a-031fa02e6e8a.png?resizew=185)
(1)若折叠前
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
(2)若梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fcd24996744442421425824bd17fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
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3 . 如图,矩形
中,
,
,
(靠近
点)、
、
分别为
,
边的三等分点.现以
为折痕把四边形
折起得到平面
,并连接
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958536559230976/2962065051262976/STEM/08d81905-1e1a-4156-a41d-2acde1c609c6.png?resizew=312)
(1)连接
,在线段
上是否存在点
,使得
平面
,并说明理由;
(2)求平面
与平面
所成锐二面角的平面角的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b73810170cfa6f37ada477d014e87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab41cce6eb2d3058a644314865d16548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab41cce6eb2d3058a644314865d16548.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958536559230976/2962065051262976/STEM/08d81905-1e1a-4156-a41d-2acde1c609c6.png?resizew=312)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c54659ae9122041c85e4acafb6e9dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5a4dfcf4c24a8ecb210cc4c53db221.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06eb87e80e424ab3ba4b77a164286ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e753e51a67ee28ca98d3908d5cb0f84.png)
您最近一年使用:0次
名校
4 . 筝形是指有一条对角线所在直线为对称轴的四边形.如图,四边形
是一个筝形,
,
,
,沿对角线
将
折起到
点,形成四棱锥
.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882139470028800/2886327225851904/STEM/451a4bb5-5624-4cf1-be10-58930b4f4b72.png?resizew=469)
(1)点
为线段
中点,求证:
平面
;
(2)当
时,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc13307a688f0820d9bc8b946b04b7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1b292baa30ffc34df3a47d57b60c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75fb6f9ad72dea327a6895915cd5355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882139470028800/2886327225851904/STEM/451a4bb5-5624-4cf1-be10-58930b4f4b72.png?resizew=469)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2977ae4bfa32de8c6f0fb136205c4fe7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9c9da1307b4cd926a5f5cdda2d4845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2194add18a7df1a23cf1554dc2da1b40.png)
您最近一年使用:0次
2022-01-03更新
|
942次组卷
|
6卷引用:浙江省绍兴市诸暨市海亮高级中学2021-2022学年高三上学期12月选考数学试题
浙江省绍兴市诸暨市海亮高级中学2021-2022学年高三上学期12月选考数学试题(已下线)专题10 立体几何线面位置关系及空间角的计算(练)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(浙江专用)》浙江省绍兴市诸暨市海亮高级中学2022届高三下学期高考前最后一卷数学试题(已下线)解密12 空间向量在空间几何体的应用(讲义)-【高频考点解密】2022年高考数学二轮复习讲义+分层训练(新高考专用)湖南省2022届高三下学期3月调研考试数学试题山东省日照实验高级中学2023-2024学年高二上学期第一次阶段性考试数学试题
名校
5 . 如图,平面内直线
与线段
相交于
点,
,且
,将此平面沿直线
折成
的二面角
平面
,点
为垂足.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/2e3ad726-0542-43da-837d-275c321b1f77.png?resizew=471)
(1)求
的面积;
(2)求异面直线
与
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3498d74b0b5ec8c99444cbc3766431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac12e718d41aa596ce6db5f0f8893634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a5da63e99d372f178569cf6e15009d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/2e3ad726-0542-43da-837d-275c321b1f77.png?resizew=471)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次