1 . 如图,在等边三角形
中,点D在边
上,连接
,将
绕点B旋转一定角度,使得
,连接
.若
,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0073c1bb2dd65fbe13fe4de579db6a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82bbe1a38d426af545e65b37b6913ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28b7171f7d47669ab587f98862e54da.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-04-13更新
|
167次组卷
|
3卷引用:2024年河南省许昌市中考二模数学试题
2 . 小明在数学课本上看到可以利用电脑绘图软件进行作图和图形的变换,很感兴趣,于是他在了解了基本作图的步骤后想画一个蝴蝶的图形,尝试了如下操作:
【实践操作】
在直线l的左侧作等腰
和等腰
,其中
,
,点O在直线l上,然后作这两个三角形关于直线l对称的图形,完成后如图①所示.
(1)连接
,
,
,下列说法中错误的是( )
A.
B.直线l垂直平分线段
C.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afe61c1e6297e3097dad64dcba430af.png)
(2)连接
,
,如图②,求证:
;
【探究发现与拓展】
小明发现,改变对称轴左边图形的形状,右边的对称图形也相应地发生了改变,于是对改变图形形状进行探究,如图③,
,
,顶点C恰好在
的中点上;
(3)求证:四边形
是平行四边形;
(4)小明尝试改变图形,将
绕点O顺时针旋转(旋转角小于
),直线
,
交于点P,当四边形
为菱形时,请求出该菱形的面积.
【实践操作】
在直线l的左侧作等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48f13317fbfbfe1c1846a0c7029ed15.png)
B.直线l垂直平分线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afe61c1e6297e3097dad64dcba430af.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e590f5138a48b432f5386d4f8cd2f0.png)
【探究发现与拓展】
小明发现,改变对称轴左边图形的形状,右边的对称图形也相应地发生了改变,于是对改变图形形状进行探究,如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d3c378b1118d331d30b63fc587b270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14c88a2d38002254d1680dabde29e98.png)
(4)小明尝试改变图形,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c69596e1040b4b35b7c1e05e2533cc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14044e842af0457b34aa46ebe8fe0c28.png)
您最近一年使用:0次
3 . 数学兴趣小组利用角平分线构造全等模型开展探究活动,请仔细阅读完成相应的任务.
活动1:用尺规作已知角的平分线、如图1所示,则由
,可得
.
中,
,
是
的平分线,在
上截取
,则
.
完成以下任务:
①
②
③
④
⑤![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)如图3,在
中,
,
是
的两条角平分线,且
交于点P,试猜想
与
之间的数量关系,并说明理由;
中,
,
,
的平分线和
的平分线恰好交于
边上的点P,若
,
,当
有一个内角是
时,请直接写出
的长:________.
活动1:用尺规作已知角的平分线、如图1所示,则由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196e376f20a7c4262b859514ed1ff5a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c8eb22438636d7806195b91924eb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cc705a620a52476840b91cb2847eb1.png)
完成以下任务:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4351a730f61bb998bab8f0b7848912d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fbd0f56b46687f9635d4a3c3f7521a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fbd0f56b46687f9635d4a3c3f7521a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3355e49927183f4b24df47725a0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d69c749dd0c28315538c23fcd75f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e221e6ebc2fb48b4893fe83a2c1ec2ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
4 . 王老师在进行“图形的变化”主题教学时,设计了如下版块.
【观察发现】
(1)如图1,在正方形网格中(每个小正方形的边长都是1),点
均在格点上(网格线的交点),且点P在线段
上,连接
,将
绕点P顺时针旋转,使点C的对应点D落在线段
上,分别作
关于直线
的对称线段
和
.则
①
______
;
②线段
可以看作是由线段
绕点P顺时针旋转______
得到.
(2)如图2、图3,
,P为
上一点,连接
,将
绕点P顺时针旋转,使点C的对应点D落在射线
上,分别作
关于直线
的对称线段
和
.请从图2、图3中任选一种情况,回答下列问题:
①求
的度数;
②连接
,请判断线段
之间的数量关系,并说明理由.
【拓展应用】
(3)在(2)的条件下,连接
,当
,
时,请直接写出线段
的长.
【观察发现】
(1)如图1,在正方形网格中(每个小正方形的边长都是1),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7678d1e51bd64475d879199b3bc26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf0a766ef79b92902be0a9b6d152685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4397f6e86c69e6b597e7e8635afbfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2、图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf0a766ef79b92902be0a9b6d152685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1513a2e14d9e8b78767766d93ad33593.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3c22dc64bb06544684c5ba23ed1586.png)
【拓展应用】
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c16c0d5c53e0e5a13cfe9f10ff4240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
5 . 问题背景如图1,在正方形
中,点E,F分别是
边上的点,且
,连接
,探究
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/0dfe9815-4fce-4e7f-9e54-032f85c1e530.png?resizew=480)
(1)探究发现 李雷同学的方法是将
绕点A顺时针旋转
至
的位置,然后再证明
,从而得到
之间的数量关系为:______;
(2)拓展延伸 如图2,在四边形
中,
,
,点E,F分别是
边上的点,且
,连接
,则(1)中结论是否仍然成立?并说明理由;
(3)归纳应用 如图3,等边三角形
的边长为4,点D,E在直线
上(点D在点E的左侧),且
,当
时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923d96dd27d3dd1a3e265d554b54ea9b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/0dfe9815-4fce-4e7f-9e54-032f85c1e530.png?resizew=480)
(1)探究发现 李雷同学的方法是将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f0fe7fae423504e161500352c5ab68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923d96dd27d3dd1a3e265d554b54ea9b.png)
(2)拓展延伸 如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3348482d11045605836c423db218e61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eb847a1722ed6e10e23c59d53fe7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)归纳应用 如图3,等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf14bc3bfe884ddfff067ba7f410b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
6 . (1)如图1,等边三角形
中,点M,N分别为
,
的中点,点P为直线
上一个动点,连接
,将
绕点N逆时针旋转
的度数得到线段
,连接
,则线段
与线段
的数量关系为___________;
(2)如图2,等腰直角三角形
中,
,点M,N分别为
,
的中点,点P为直线
上一个动点,连接
,将
绕点N逆时针旋转
的度数得到线段
,连接
.
①求线段
与线段
的数量关系,并说明理由;
②若
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
(2)如图2,等腰直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
①求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6401db4973340af67dd1361a8cbec26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
您最近一年使用:0次
2024-04-08更新
|
43次组卷
|
2卷引用:2024年河南省周口市沈丘县2校联考一模数学模拟试题
7 . 李老师善于通过适当地整合教学内容,帮助同学们用整体的、联系的、发展的眼光看问题,形成科学的思维习惯.下面是李老师设计的问题,请你解答.
问题1:对称
如图1,在平面直角坐标系中,有点
和点
,现需要在x轴上找一点P,使
最小,可以先找出点A关于x轴的对称点坐标
,然后连接
交x轴于点P,此时点P就是所求.
(1)点
的坐标是________,点P的坐标是________;
(2)线段
可以绕点
顺时针旋转至少________
与线段
共线;
问题2:全等
如图2,在
中,
,D,E,F分别在BC,AC,AB上,
,
.
(3)求证:
;
(4)若
,求
;
问题3:对称与全等.
(5)如图3,有一片形状为菱形ABCD的湿地,
,点A,C之间的距离为
,计划在湿地内圈出一个动物保护区(即
区域),点E,F分别在线段BC,AB上,
,
,
,点A和点O是巡视员休息站,点O是菱形ABCD的对称中心.为方便定时检查动物保护区,现要沿OG,AG开辟两条笔直的小道,根据要求小道OG和AG的总长要尽可能小,直接写出
的最小值.
问题1:对称
如图1,在平面直角坐标系中,有点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552077386ae0da5e2635d1bcce594fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b36c130a297aa266e8d3e28c568f48.png)
问题2:全等
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a35c74cc181f1693e7720a3a562d1c.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ed70a96ff992f1d2464ed2965486a3.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
问题3:对称与全等.
(5)如图3,有一片形状为菱形ABCD的湿地,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695525d00319665b1ad0d01717979523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7214611384485b25e300a2fbe2a3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d43a8a9de30fdb495fa1bba15c8d4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d0caa0959f8fc2fc1284b9f113bf61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87eca785f50db758428084a30beba66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/cccaff09-d455-40ed-868f-5a83ade4417f.png?resizew=519)
您最近一年使用:0次
8 . 如图,
是等边三角形,点D是平面内一点,连接
,把线段
绕点C顺时针旋转
得到线段
,连接
,直线
和直线
相交于点F.
(1)如图1,当点D在三角形内部时,线段
与
的数量关系是_____________,
的度数是___________
;
(2)如图2,当点D在三角形边
上时,猜想
与
的位置关系,并对你的猜想进行证明;
(3)在(2)的条件下,若点G是线段
的中点,当
最小时,请在图3中画出
,并直接写出当
时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/88364563-9743-49be-bcab-9399c704953f.png?resizew=565)
(1)如图1,当点D在三角形内部时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,当点D在三角形边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)在(2)的条件下,若点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
9 . 在等腰直角三角形
中,
,
,点
为直线
上一个动点,绕点
将射线
逆时针旋转
,交直线
于点
.
绕点
逆时针旋转
得到
,连接
,
,
,
,
又
,
,
.
请阅读上述过程,并完成以下问题:
(1)得出
的依据是______(填序号).
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)在以上条件下,如图2,当点
在线段
的延长线上时,求证:
.
(3)在等边三角形
中,
,点
为射线
上一个动点,将射线
绕点
逆时针旋转
交直线
于点
,将
绕点
逆时针旋转
得到
,连接
,当
为直角三角形时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d011d6ad89d0b033f96c2efbb314d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0823d7addcc733baeb98c181bb383fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884782796046ca51149c370aeac25a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c162245c8ea36219495ae4b8b640a750.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad531d18222c3a7274064a33fd9906b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71df207da4b07956b8ae8cd0a640fc18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eef7c80c6f50b064b2c2ff334c9bb13.png)
请阅读上述过程,并完成以下问题:
(1)得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546ebba737424c7e73c4fff54f01937e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)在以上条件下,如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872788cb4c81767b75afbfe812de9c27.png)
(3)在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d011d6ad89d0b033f96c2efbb314d78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf173f2377cc32d2a33d889729a224e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
10 . 如图,菱形
中,对角线交于点O,将
绕点C逆时针旋转得到
,其中点A,D的对应点分别为点M,N,设旋转角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/7baadc13-e4c0-498e-a56a-d7d2583f804b.png?resizew=413)
(1)当
时:
①当点M落在
上时,
的度数为______;
②如图2,当
时,
交
于点G,判断四边形
的形状并说明理由.
(2)当
时,连接
.若
,
,当
与菱形
的边平行时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/7baadc13-e4c0-498e-a56a-d7d2583f804b.png?resizew=413)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
①当点M落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ce32435647d7324b3c40a3fa758fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2087c75698a3141f71fc464ccb3f9cb6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783d872617eed2bbd474035156b6caaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4474a2abc0e638b50e82de1c76ad02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
您最近一年使用:0次