如图,在△ABC中,
,
与
的平分线相交于点
,解答下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/4eb69680-bc1c-41e6-a57f-c481b5bd1b38.png?resizew=125)
(1)求
的度数;
(2)求证:
(r为三角形内切圆的半径).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/4eb69680-bc1c-41e6-a57f-c481b5bd1b38.png?resizew=125)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cc922cec597c3fb4c5800a6b6f1336e.png)
2022高一·全国·专题练习 查看更多[1]
(已下线)1.3.2 三角形的“四心”(分层练习)-2022年初升高数学无忧衔接
更新时间:2022-07-09 11:46:26
|
【知识点】 图形的性质
相似题推荐
解答题-问答题
|
适中
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名校
【推荐1】如图所示,在平面直角坐标系中有一矩形纸片
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa701a194c619fb03b9a3d159542918.png)
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119376378232832/3119619638607872/STEM/9444701be2744ac8b871aea77a7e2b93.png?resizew=202)
(1)将
沿
翻折,使点
落在
轴上的点
处,求线段
的长;
(2)在(1)中,设
与
的交点为
,如果点
在抛物线
上,求抛物线与
的另一交点坐标(除
点外);
(3)如果将矩形纸片沿某直线
对折,使点
落在坐标轴上的点
处,且
与
的交点
恰好落在(2)的抛物线上.除了上述的点
外,这样的点
是否存在?如果存在,求出点
的坐标,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa701a194c619fb03b9a3d159542918.png)
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119376378232832/3119619638607872/STEM/9444701be2744ac8b871aea77a7e2b93.png?resizew=202)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)在(1)中,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4cf40b6cf2051622c0a52e84710c138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如果将矩形纸片沿某直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知四边形ABCD,将线段AB绕点A旋转任意角度
,得到线段AE,连接BE,DE.
(1)当四边形ABCD为正方形,点E在正方形ABCD的内部时,如图①.若AE平分
,
,则
度,四边形ABED的面积为 ;
(2)当四边形ABCD为正方形,点E在正方形ABCD的外部时,且
.
①在图②中依题意补全图形,并求
的度数;
②作
的平分线AF交ED于点G,交EB的延长线于点F,连接DF,请用等式表示线段BE,FA,FD之间的数量关系,并说明理由;
(3)当四边形ABCD为菱形,点E在菱形ABCD的外部时,如图③.菱形ABCD的面积为
,
,过点C作CM垂直EB的延长线于点M,延长MC交ED的延长线于点P,连接BP.试判断BP是否存在最大值,若存在,请求出BP的最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(1)当四边形ABCD为正方形,点E在正方形ABCD的内部时,如图①.若AE平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/7312d375-901b-45cb-bc76-193d8e4a2640.png?resizew=93)
(2)当四边形ABCD为正方形,点E在正方形ABCD的外部时,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
①在图②中依题意补全图形,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/df4bdc18-4896-424c-ad9d-a231ca7bd305.png?resizew=93)
②作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
(3)当四边形ABCD为菱形,点E在菱形ABCD的外部时,如图③.菱形ABCD的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bb52bec7f09eaf568dca3b4a4fc717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/088952db-e59f-4088-9fb3-c414096b77b8.png?resizew=183)
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