下图中的两个正方形的边长相等,请你指出可以通过绕点O旋转而相互得到的图形并说明旋转的角度.
![](https://img.xkw.com/dksih/QBM/2018/2/13/1881617286291456/1881996735520768/STEM/c7adf3a3217047e5a9510e40b0dd97af.png?resizew=158)
更新时间:2018-02-14 09:15:04
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】在△ABC中,AB=AC=2,∠BAC=90°,将边AB绕点A逆时针旋转至AB′,记旋转角为α.分别过A,C作直线BB′的垂线,垂足分别是E,F,连接B′C交直线AF于点Q.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960689287593984/2961613246193664/STEM/139e6ac3-f90f-41b7-ac17-cb12752bff6a.png?resizew=358)
(1)如图1,当α=45°时,△AEF的形状为 ;
(2)当0°<α<360°时,
①(1)中的结论是否成立?如果成立,请就图2的情形进行证明;如果不成立,请说明理由;
②在旋转过程中,当四边形AECF为平行四边形时,请直接写出CF的长.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960689287593984/2961613246193664/STEM/139e6ac3-f90f-41b7-ac17-cb12752bff6a.png?resizew=358)
(1)如图1,当α=45°时,△AEF的形状为 ;
(2)当0°<α<360°时,
①(1)中的结论是否成立?如果成立,请就图2的情形进行证明;如果不成立,请说明理由;
②在旋转过程中,当四边形AECF为平行四边形时,请直接写出CF的长.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,在平面直角坐标系中,直线
分别与
轴、y轴交于点A、点B,将
绕坐标原点逆时针旋转
得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/88a1558f-d6e3-4afb-8470-e2bc262b21c0.png?resizew=191)
(1)求直线
的函数表达式;
(2)若点Р是直线
上一点,点Q是x轴上一点(点Q不与点O重合),当
与
全等时,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a98e24892abc0eb34d5216d4e89c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/88a1558f-d6e3-4afb-8470-e2bc262b21c0.png?resizew=191)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)若点Р是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】我们定义:如图1,在
中,把
绕点A顺时针旋转
得到
,把
绕点A逆时针旋转
得到
,连接
,当
时,我们称
是
的“旋补三角形”,
边
上的中线
叫做
的“旋补中线”,点A叫做“旋补中心”.
【阅读材料】(1)如图2,在
中,若
,
.求
边上的中线
的取值范围.是这样思考的:延长
至E.使
,连结
,利用全等将边
转化到
,在△
中利用三角形三边关系即可求出中线
的取值范围,则中线
的取值范围是______;
【问题探索】(2)如图1,
是
的“旋补三角形”,
是
的“旋补中线”,请仿照上面材料中的方法,探索图1中
与
的数量关系,并给予证明;
【拓展运用】(3)如图3,当
时,
是
的“旋补三角形”,
,垂足为点E,
的反向延长线交
于点D,若
,
,试求解
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc18d7c5f9903ab90e40b0d9d62b105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/ccf9e449-0bf9-47a4-aa65-973b8ccfa291.png?resizew=440)
【阅读材料】(1)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f94cb32b388456ab9203e8d8b5309e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【问题探索】(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【拓展运用】(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85db690dce9101480ddf794707fd6fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次