如图,在
中,
,
,将
绕点A顺时针方向旋转60°到
的位置,连接
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860094851407872/2862284070158336/STEM/12ae16f7-9603-45ed-8fc2-3b3caaabd1ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7cf722ab91669117197c6a930e28b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15468257071ad6064faed40b8e14476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6541e0c895bbb68e8070b60996be72.png)
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860094851407872/2862284070158336/STEM/12ae16f7-9603-45ed-8fc2-3b3caaabd1ce.png)
A.15° | B.20° | C.30° | D.45° |
21-22九年级上·黑龙江哈尔滨·期中 查看更多[4]
黑龙江省哈尔滨市香坊区哈尔滨德强学校2021-2022学年九年级上学期期中数学试题黑龙江省哈尔滨市南岗区第一五六中学2023-2024学年九年级上学期月考数学(五四制)试题黑龙江省哈尔滨市南岗区第一五六中学校2023-2024学年九年级上学期9月月考数学试题(已下线)寒假作业13 全等三角形的基本模型(14道经典题型+4道中考真题)-【寒假分层作业】2024年八年级数学寒假培优练(人教版)
更新时间:2021-11-30 09:14:45
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【推荐1】如图,AB是⊙
的直径,线段DC是⊙
的弦,连接AC、OD,若
于点E,
,
,则阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934884289740800/2938070025322496/STEM/65e35390-55b9-4f02-9528-360730469653.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11c1db76cc7e1894f74a50d71736455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://img.xkw.com/dksih/QBM/2022/3/12/2934884289740800/2938070025322496/STEM/65e35390-55b9-4f02-9528-360730469653.png?resizew=191)
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【推荐2】数学课上,探究角的平分线的作法时,小宇用直尺和圆规作∠AOB的平分线,方法如下:
如图,(1)以点O为圆心,适当长为半径画弧,交OA 于点M,交OB 于点N;
(2)分别以点M,N为圆心,大于
MN 的长为半径画弧,两弧在∠AOB的内部相交于点C;
(3)画射线OC.射线OC即为所求. 其中的道理是,作出△OMC≌△ONC,根据全等三角形的性质,得到∠AOC=∠BOC,进而得到OC是∠AOB的平分线. 其中,△OMC≌△ONC的依据是( )
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671411469557760/2674392331288576/STEM/b0254350fa3d498297a93743cbc24ad9.png?resizew=133)
如图,(1)以点O为圆心,适当长为半径画弧,交OA 于点M,交OB 于点N;
(2)分别以点M,N为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)画射线OC.射线OC即为所求. 其中的道理是,作出△OMC≌△ONC,根据全等三角形的性质,得到∠AOC=∠BOC,进而得到OC是∠AOB的平分线. 其中,△OMC≌△ONC的依据是( )
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671411469557760/2674392331288576/STEM/b0254350fa3d498297a93743cbc24ad9.png?resizew=133)
A.SSS |
B.SAS |
C.ASA |
D.AAS |
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【推荐1】如图,在边长为6的正方形
中,将含
角的直角三角板.按如图所示放置,边
分别交
于点
,连接
.则下列结论:①
;②当
为
的中点时,
为
的中点;③当
为
的中点时,
的面积为15;④点
到
的距离为6.其中正确的结论为()
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26260c10afb34f543d86b67898134f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8c24906872c98c181f198ee0ab6e48.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,边长为9的等边三角形ABC中,M是高CH所在直线上的一个动点,连接MB,将线段BM绕点B逆时针旋转60°得到BN,连接HN.则在点M运动过程中,线段HN长度的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/83383c08-2b6c-4f8e-9890-fbbaefa59b6e.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/83383c08-2b6c-4f8e-9890-fbbaefa59b6e.png?resizew=131)
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【推荐1】如图,P是等边
外一点,把BP绕点B顺时针旋转60°到
,已知
,
,则
( )
![](https://img.xkw.com/dksih/QBM/2021/7/25/2777651964280832/2790422618447872/STEM/038e4ec7-7935-4234-b472-ee3ed6e159ac.png)
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【推荐2】如图,
,OA=OB=6,点C,D分别为线段OA,OB上的动点(C,D不与A,B重合),则AD+CD+BC的最小值为( )
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331628851617792/2331835277492224/STEM/59a1087052db438cb09d279611e38750.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7223d437dd2ce0ea76521228b00ed4fb.png)
![](https://img.xkw.com/dksih/QBM/2019/11/11/2331628851617792/2331835277492224/STEM/59a1087052db438cb09d279611e38750.png?resizew=161)
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【推荐1】如图,在
中,
,以点
为旋转中心把
按顺时针旋转一定角度,得到
点
恰好落在
上,连接
则
度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ad8a02402bf8e03dd0d3ca08447ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/ec2c4a2f-7d86-4ea1-8691-3991f292e336.png?resizew=160)
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【推荐2】如图所示,在
中,将
绕点A顺时针旋转得到
.点B的对应点恰好落在BC边上,
,则
的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/78728e4b-abe5-478f-af7d-dd417d0a29b4.png?resizew=166)
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A.![]() | B.![]() | C.![]() | D.![]() |
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