如图,在
中,
,
,将点A与点B分别沿
和
折叠,使点A、B与点C重合,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/121e9fcc9bc34218be7c18129e1ff037.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/1f68aa26-d6b5-4a7a-af0e-581d862710ed.png?resizew=238)
A.![]() | B.![]() | C.![]() | D.![]() |
22-23七年级下·重庆沙坪坝·阶段练习 查看更多[2]
重庆市沙坪坝区第七中学校2022-2023学年七年级下学期第二次月考数学试题(已下线)专题11.17 三角形(全章分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)
更新时间:2023-06-25 12:57:05
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【推荐1】如图,将平行四边形
沿对角线
折叠,使点
落在点
处,若
,
为( )
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980802610274304/2984290801893376/STEM/1951d882-5719-4254-b5b2-d37969d72d9a.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d77ba4183956bd9714a48e8088565b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980802610274304/2984290801893376/STEM/1951d882-5719-4254-b5b2-d37969d72d9a.png?resizew=179)
A.136° | B.144° | C.108° | D.114° |
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【推荐2】如图①,在△ABC 中,D,E 分别是 AB,AC 的中点,把△ADE 沿线段 DE 向下折 叠,使点 A 落在 BC 上的点 A′处,得到图②,则下列四个结论中,不一定成立的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/2d2cedaf-f15f-4888-afc0-ee23cafb4c8f.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/2d2cedaf-f15f-4888-afc0-ee23cafb4c8f.png?resizew=193)
A.DB=DA | B.∠B+∠C+∠1=180° |
C.BA=CA | D.△ADE≌△A′DE |
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【推荐1】如图,三角板
的顶点
,
分别落在一组平行线
与
上,已知
,
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db154678dacd684a1df5f263e3665e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,将其绕点A逆时针旋转得到△ADE,若∠B=60°,则∠EAD的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/4842fd7a-5a21-40be-9c59-ea8a50909218.png?resizew=225)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/4842fd7a-5a21-40be-9c59-ea8a50909218.png?resizew=225)
A.20° | B.30° | C.40° | D.50° |
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