名校
1 . 如图,在菱形
中,
,
,将
沿
折起,使A到
,点
不落在底面
内,若
为线段
的中点,则在
翻折过程中,以下说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bbaccd578a43b2397c8bdd50592fa07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/bab98cd5-0e63-4d42-9bcd-db11d8ff4242.png?resizew=225)
A.存在某一位置,使得![]() |
B.异面直线![]() ![]() |
C.四面体![]() ![]() |
D.当二面角![]() ![]() ![]() ![]() |
您最近一年使用:0次
2023-07-27更新
|
509次组卷
|
3卷引用:四川省攀枝花市2022-2023学年高一下学期期末数学试题
四川省攀枝花市2022-2023学年高一下学期期末数学试题辽宁省沈阳市第一二〇中学2023-2024学年高二上学期期初考试数学试题(已下线)第四章 立体几何解题通法 专题二 升维法 微点3 升维法综合训练【培优版】
名校
2 . 如图,平面四边形
是由正方形
和直角三角形
组成的直角梯形,
,
,现将
沿斜边
翻折成
(
不在平面
内),若
为
的中点,则在
翻折过程中,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/8436716f-7551-4e6f-9c6c-92cb240c0bff.png?resizew=409)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d8db2651871f405f510d3e0c550607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41225b0c6ff901aef01d5094310b82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1335dec9b6a1dcc7b18f7b3989c4cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41225b0c6ff901aef01d5094310b82b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/8436716f-7551-4e6f-9c6c-92cb240c0bff.png?resizew=409)
A.![]() ![]() |
B.三棱锥![]() ![]() |
C.若![]() ![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
2022-07-09更新
|
1654次组卷
|
3卷引用:四川省泸州市泸县第五中学2022-2023学年高一下学期期末数学试题
3 . 如图,已知正方体
的棱长为2,点E,F,G,H,I分别为线段
,
,
,BC,
的中点,连接
,
,
,DE,BF,CI,EH,则下列正确结论的序号是______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/ecb2fd98-bc9d-4491-97e3-678b2656b30b.png?resizew=156)
①点E,F,G,H在同一个平面上;
②直线DE,BF,CI交于同一点;
③直线BF与直线
所成角的余弦值为
;
④该正方体过EH的截面的面积最大值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/27/ecb2fd98-bc9d-4491-97e3-678b2656b30b.png?resizew=156)
①点E,F,G,H在同一个平面上;
②直线DE,BF,CI交于同一点;
③直线BF与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
④该正方体过EH的截面的面积最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
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