在等边
中,
是边
上一点,连接
,将
绕点
逆时针旋转
,得到
,连接
,若
,
,有下列结论:①
;②
;③
是等边三角形;④
的周长是
.其中,正确结论的个数是 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/8b4360e4-d067-4b7f-9cd3-ec5f118a8ab9.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882589c896c6993d9687f0e14a283481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7909220d1db380634534190b662ee0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a3a3d168a18401e47576f70a692e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6904f78bb6884bf09adbe32f5df197b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3207084f12acfa525d5b5b569cb7131e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627eed7e827eb83cbd1b7674bdacd778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e15fb05fa43139f0305756f5ea130e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be6ecf2ca71bf4cb32e491195266a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27be1bc69a84a2ace8667acd203e54a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c9fc4598bc2dba33b1d193cb04654d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f3515a4a6f7b71e7823e12f0a26de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2299c9e97815f2b4c3213ba4e59ea3dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac11d081a0da527109f6a347ebd561b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/8b4360e4-d067-4b7f-9cd3-ec5f118a8ab9.png?resizew=214)
A.![]() | B.![]() | C.![]() | D.![]() |
18-19九年级上·全国·单元测试 查看更多[11]
2018秋人教版九年级数学上册:第二十三章 旋转章末检测题(B)【校级联考】黑龙江佳木斯市建三江农垦管理局15校2019届九年级上学期期中考试数学试题2018-2019学年八年级数学下册北师大版习题:期中检测卷(已下线)【区级联考】天津市和平区2019届九年级下学期结课质量调查数学试题【区级联考】天津市和平区2019届中考模拟数学试题【区级联考】天津和平区2019届九年级第二学期结课质量调查数学试题吉林省白城市洮北区三合乡中学2020届九年级9月月考数学试题2019年重庆市渝中区求精中学中考数学一模试卷天津市和平区2019-2020学年九年级上学期数学期末试题(已下线)期末检测(3)-2020-2021学年八年级数学上册十分钟同步课堂专练(沪科版)黑龙江省同江市六校2021-2022学年九年级上学期期中考试数学试题
更新时间:2020-01-12 18:23:44
|
【知识点】 旋转综合题(几何变换)
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图,将ΔABC沿BC翻折得到ΔDBC,再将ΔDBC绕C点逆时针旋转60°得到ΔFEC,延长B D交EF于H,已知∠ABC=30°,∠BAC=90°,AC=1,则四边形CDHF的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/eeae463d-5059-4a9a-b917-2ca84e5ccc38.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/eeae463d-5059-4a9a-b917-2ca84e5ccc38.png?resizew=135)
A.![]() | B.![]() | C.![]() | D..![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图,△ABC中,∠C=90°,∠B=30°,AC=
,D、E分别在边AC、BC上,CD=1,DE∥AB,将△CDE绕点C旋转,旋转后点D、E对应的点分别为D′、E′,当点E′落在线段AD′上时,连接BE′,此时BE′的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/ee37acd9-6a69-477c-b945-3e555069bd65.png?resizew=163)
A.2![]() | B.3![]() | C.2![]() | D.3![]() |
您最近一年使用:0次