如图,在Rt
ABC中,∠BAC=90°,∠ABC=40°,将
ABC绕A点顺时针旋转得到
ADE,使D点落在BC边上.
(1)求∠BAD的度数;
(2)求证:A、D、B、E四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求∠BAD的度数;
(2)求证:A、D、B、E四点共圆.
![](https://img.xkw.com/dksih/QBM/2021/12/5/2865757100892160/2867438043856896/STEM/da6f1708-0d26-45d4-bf20-4c2e979bc3d5.png?resizew=161)
21-22九年级上·福建福州·期中 查看更多[9]
福建省福州市永泰县2021-2022学年九年级上学期期中数学试题(已下线)专题24.13 四点共圆(知识讲解)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)专题24.14 四点共圆(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)初中数学综合实践作业---应用探究类(人教版九年级上册第二十四章:圆探究四点共圆的条件)福建省福州第三中学晋安校区2021-2022学年九年级上学期10月月考数学试卷(已下线)专题3.16 四点共圆(圆内接四边形)(知识讲解)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)(已下线)专题3.17 四点共圆(圆内接四边形)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)(已下线)重难点02“四点共圆”模型-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)(已下线)24.4(培优课)辅助圆、隐圆(题型精讲精练)-【题型分类精粹】2023-2024学年九年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)
更新时间:2021-12-07 16:00:32
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解答题-问答题
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适中
(0.65)
【推荐1】如图,将
绕点A按逆时针方向旋转,得到
,其中点B与点E是对应点,点C与点D是对应点,且
,若
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
,将
绕点
按逆时针方向旋转
得到
,延长
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2023/6/29/3270287713034240/3277787623071744/STEM/04234244dee641b6843b330530654bae.png?resizew=182)
(1)求
的度数;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
(2)求
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在等腰
中,
,P是
内一点,
,
,将
绕点A逆时针旋转后与
重合.求:
(1)线段
的长;
(2)
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f82a30d6b232dc4d8f35d2d6e0e0f42.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30e668a1d0d7252f4b52c3f34ddf402a.png)
(1)线段
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(2)
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解答题-证明题
|
适中
(0.65)
【推荐2】已知四边形ABCD是正方形,点P在直线BC上,点G在直线AD上(点P、点G不与正方形顶点重合,且在CD的同侧),PD=PG,DF⊥PG于点H,交直线AB于点F,将线段PG绕点P逆时针旋转90°得到线段PE,连接EF.
(1)如图1,当点P与点G分别在线段BC与线段AD上时,
①求证:DF=PG;
②请猜想四边形PEFD是怎样的特殊四边形,并证明你的猜想;
(2)如图2,当点P与点G分别在线段BC与线段AD的延长线上时,四边形PEFD的形状是否发生了变化?请写出你的结论.
(1)如图1,当点P与点G分别在线段BC与线段AD上时,
①求证:DF=PG;
②请猜想四边形PEFD是怎样的特殊四边形,并证明你的猜想;
(2)如图2,当点P与点G分别在线段BC与线段AD的延长线上时,四边形PEFD的形状是否发生了变化?请写出你的结论.
![](https://img.xkw.com/dksih/QBM/2022/1/9/2890544254689280/2890896011280384/STEM/5cd2c147-ea57-46d8-aba0-b3ad1cb2c896.png?resizew=373)
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解答题-作图题
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适中
(0.65)
【推荐1】如图,将
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(1)画出
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(2)直线
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(1)画出
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(2)直线
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
与
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,连接
且
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(3)
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