如图,将一个矩形ABCD绕点A顺时针旋转
,得到矩形
,连接BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/098b14e0-3b59-4ef6-ad27-56d499555bb8.png?resizew=632)
(1)探究:
①如图1,当
时,点
恰好在DB的延长线上,若
,求BC的长;
②如图2,连接
,过点
作
交BD于点M,线段
与DM相等吗?请说明理由.
(2)在探究(1)②的条件下,射线DB分别交
,
于点P,N(如图3).求证:
①
;
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773a1cd6395165c5a99166f7b762d4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad194a7c911eef46cf9a07eb4d6096f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/098b14e0-3b59-4ef6-ad27-56d499555bb8.png?resizew=632)
(1)探究:
①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
②如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdccb866e9273bb8bc2609e1b4615f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5563473602e1b17d582a165b7b7b6b2.png)
(2)在探究(1)②的条件下,射线DB分别交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b640e4aa30e0a38a86563c0e0f7ad3f8.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d244abcb47f7f2e2be0f69a99f81b030.png)
更新时间:2022-03-09 18:54:21
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,直线
:
与坐标轴分别交与
、
两点,
与
轴相切于点
连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/61f410ce-d733-4505-8a5d-80cc7548be22.png?resizew=306)
(1)
的度数是 .
(2)若直线
以每秒
的速度绕点
顺时针旋转
秒
,当直线
与
有公共点时,
的取值范围是 .
(3)在(2)的条件下,直线与
有公共点的条件下,若
在直线
上截得的弦的中点为
.试判断
的度数是否会发生变化,并说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aeb71ae0a3cb5549d233528bcc8de81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bc74e74c03542aea89542865acc8fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/61f410ce-d733-4505-8a5d-80cc7548be22.png?resizew=306)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17e587b7fcc3f7ef52c0a542141daa2.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee80cf10dd820f5e091eda5600e2bf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,直线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在菱形ABCD中,
是锐角,点E是BC边上的动点(不与点B,C重合),将射线AE绕点A按逆时针方向旋转,交线段CD于点F.当
时,延长线段BC交射线AF于点M,延长线段DC交射线AE于点N,连接AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/d23dcd1d-65c6-43cb-88c5-19d6e2ca4b74.png?resizew=223)
(1)求证:
;
(2)连接MN,若
,
,则当
是以MN为腰的等腰三角形时,求CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/d23dcd1d-65c6-43cb-88c5-19d6e2ca4b74.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26059f3aba426f4e9de7b5ff6112715c.png)
(2)连接MN,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】“启智”数学兴趣小组对图形的旋转展开进一步探究,总结了一些方法和规律,请你完成相关问题.(画图工具不限,不写画法)
(1)动中有定:
如图1,
是边长为
的等边三角形.
①将点
绕点
顺时针旋转一周,点
的对应点为点
,请在图1中画出点
的运动路径,当点
不与A、B重合时,可得
__________
或__________
;
②将边
绕点
顺时针旋转一周,请在图1中画出线段
扫过的区域(用阴影表示,画出必要的辅助线),并求出该区域的面积.
(2)以静制动:
如图2,
中,
,
,将
绕点
旋转得
,点P是线段
上一个动点,点M是
的中点.
①线段
的最小值是__________,最大值是__________;
②点P到直线
的距离为h,当
时,求h的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/bcc99d52-076a-4e0c-8b92-8956911c9f43.png?resizew=324)
(1)动中有定:
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
①将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c96a4e6263a9d076a6fdee343f4371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②将边
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)以静制动:
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b185184dc2dc3894a0313fd13f26a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
②点P到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】综合与实践:数学是以数量关系和空间形式为主要研究对象的科学,数学实践活动有利于我们在图形运动变化的过程中去发现其中的位置关系和数量关系,让我们在学习与探索中发现数学的美,体会数学实践活动带给我们的乐趣.
转一转:如图1,在矩形
中,点E,F,G分别为边
的中点,连接
,H为
的中点,连接
.将
绕点B旋转,线段
和
的位置和长度也随之变化.
,此时点E落在
的延长线上,点F落在线段
上,连接
,请直接写出
与
之间的数量关系:_________.
(2)图3中,
,求
的值.
剪一剪,折一折:
(3)在(2)的条件下,连接图3中矩形的对角线
,并沿对角线
剪开,得到
(如图4).点M,N分别在
上,连接
,将
沿
翻折,使点C的对应点P落在
的延长线上,若
平分
,则
的长为_________.
转一转:如图1,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0f0fab10b2db253cc640dfa70c6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b1405137f3fdd1fff5fd5de96c0fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf95fe7da1e6acf64ab0da6d4bce66b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)图3中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb9ed77d586a7976de01e7551cdb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e15cfa1cd8e8159d9246897678d26d.png)
剪一剪,折一折:
(3)在(2)的条件下,连接图3中矩形的对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.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/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d65a776109a24981277b0f3e05b96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图1,四边形
内接于
,对角线
交
于点G,
,点F在线段
上,且
.
,请用
的代数式表示
;
(2)求证:
;
(3)如图2,延长
交
于点M,连结
.
①若
为
的直径,
,
,求
的长;
②若
,猜想
的度数,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/5142949086fdc50bacd01b9ab9202320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22437a2a3402609bfd4054a9f2b6c685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f6fb8fc16683efeff67b9ab9dce44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc382c4f315de17f293d3d273626ade2.png)
(3)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1151ba76a3fa37ae490da24bb70807a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1718dbdfc8798daef0663cdf505b08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719f0052d6bfe916ce32d68f7f8074f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
您最近一年使用:0次