名校
1 . 如图1,正方形
的边长为2,点
为
的中点,将
沿
所在直线进行翻折,得到四棱锥
,如图2,则在翻折的过程中,下列命题正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/7/1/2755124704993280/2760296730976256/STEM/f07ff53b6e3a42ab91b27bac076f1e80.png?resizew=336)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e5108c34fe4bdd89fd9d75ea54f446.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2755124704993280/2760296730976256/STEM/f07ff53b6e3a42ab91b27bac076f1e80.png?resizew=336)
A.点![]() |
B.存在某一翻折位置使得![]() ![]() |
C.存在某一翻折位置使得![]() ![]() |
D.当二面角![]() ![]() ![]() ![]() |
您最近一年使用:0次
2021-07-09更新
|
644次组卷
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4卷引用:湖北省2020-2021学年高一下学期7月期末数学试题
湖北省2020-2021学年高一下学期7月期末数学试题江西省九江市五校2021-2022学年高一下学期期末测试数学试题(已下线)第九章立体几何专练16—翻折问题-2022届高三数学一轮复习广东省广州市广东实验中学越秀学校2023-2024学年高二上学期期中数学试题
名校
解题方法
2 . 如图,已知正方体
的棱长为
,
、
分别是棱
、
的中点.若点
为侧面正方形
内(含边界)动点,且
平面
,则点
的轨迹长度为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/5df58cb6-0a81-4e9b-91d7-6a276a8cc68c.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b668b5c01e0b1a529cc4e3efb2e9057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/5df58cb6-0a81-4e9b-91d7-6a276a8cc68c.png?resizew=146)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-01-02更新
|
647次组卷
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5卷引用:湖北省部分重点高中2020-2021学年高一下学期四月联考数学试题