平面内,如图,在□ABCD中,AB=10,AD=15,
,点P为AD边上任意点,连接PB,将PB绕点P逆时针旋转90°得到线段PQ.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/d2fa92b4-4809-4831-a31c-c5e1bb226280.png?resizew=261)
(1)当∠DPQ= 10°时,求∠APB的大小;
(2)当
时,求点Q与点B间的距离(结果保留根号);
(3)若点Q恰好落在口ABCD的边所在的直线上,直接写出PB旋转到PQ所扫过的面积.(结果保留π).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de28d337fb56eb2417a4902294545905.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/d2fa92b4-4809-4831-a31c-c5e1bb226280.png?resizew=261)
(1)当∠DPQ= 10°时,求∠APB的大小;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e6cac8bbce3bf5fafb7444c0e43435.png)
(3)若点Q恰好落在口ABCD的边所在的直线上,直接写出PB旋转到PQ所扫过的面积.(结果保留π).
17-18九年级上·浙江杭州·期中 查看更多[14]
浙江杭州拱墅区文澜中学2018届九年级上学期期中考试数学试题(已下线)2年中考1年模拟 第四篇 图形的性质 专题24 圆的有关计算(已下线)决胜2018中考压轴题全揭秘 专题24 几何综合问题(已下线)2年中考1年模拟 第五篇 图形的变化 专题28 锐角三角函数2019年浙江省丽水市实验学校数学中考模拟试卷(已下线)【万唯原创】2019年河北省中考数学试题研究正文-第二部分题型4+5(已下线)【万唯原创】2019年河北省中考数学面对面正文-第二部分题型5(已下线)【万唯原创】2018年河北省中考数学-面对面-第二部分题型9(已下线)【万唯原创】2020年河北中考数学-面对面-第二部分专题七(已下线)【万唯原创】旋转问题·满分专练(已下线)【万唯原创】旋转问题·基础专练(一)(已下线)【万唯原创】旋转问题·基础专练(二)(已下线)【万唯原创】2021年河北试题研究-讲册第二部分-专题五河北省石家庄市第八十一中学2021-2022学年九年级上学期期中数学试题
更新时间:2019-06-19 11:04:06
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解答题-证明题
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【推荐1】如图,在矩形
中,
,
,G,H分别是
边上的点,且
,E,O,F分别是对角线
上的四等分点,顺次连接G,E,H,F,G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/4b154665-8987-43f5-bb73-71d3866d9129.png?resizew=183)
(1)求证:四边形
是平行四边形;
(2)填空:①当
时,四边形
是矩形;
②当
时,四边形
是菱形;
(3)求四边形
的周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6baf820ff60f2015ae352f2b1bc3aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/4b154665-8987-43f5-bb73-71d3866d9129.png?resizew=183)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f5915a8893146e125450e8e9a2a11.png)
(2)填空:①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c69a9feb14d4b9ccba6ae42837fd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f5915a8893146e125450e8e9a2a11.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c69a9feb14d4b9ccba6ae42837fd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f5915a8893146e125450e8e9a2a11.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356f5915a8893146e125450e8e9a2a11.png)
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【推荐2】如图1,正方形OABC与正方形ODEF放置在直线l上,连结AD、CF,此时AD=CF.AD⊥CF成立.
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573916328484864/1573916334317568/STEM/ab74c3ce8f004503af2fb8d02cb232e0.png?resizew=501)
(1)正方形ODEF绕O点逆时针旋转一定的角度,如图2,试判断AD与CF还相等吗?若成立,请证明;若不成立,请说明理由.
(2)正方形ODEF绕O点逆时针旋转,使点E旋转至直线l上,如图3,求证:AD⊥CF.
(3)在(2)小题的条件下,AD与OC的交点为G,当AO=3,OD=
时,求线段CG的长.
![](https://img.xkw.com/dksih/QBM/2015/9/24/1573916328484864/1573916334317568/STEM/ab74c3ce8f004503af2fb8d02cb232e0.png?resizew=501)
(1)正方形ODEF绕O点逆时针旋转一定的角度,如图2,试判断AD与CF还相等吗?若成立,请证明;若不成立,请说明理由.
(2)正方形ODEF绕O点逆时针旋转,使点E旋转至直线l上,如图3,求证:AD⊥CF.
(3)在(2)小题的条件下,AD与OC的交点为G,当AO=3,OD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐3】矩形ABCD中,
=
(k>1),点E是边BC的中点,连接AE,过点E作AE的垂线EF,与矩形的外角平分线CF交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/bcddbed5-6677-42a7-9b9f-67aaf5322d4b.png?resizew=639)
(1)【特例证明】如图(1),当k=2时,求证:AE=EF;
小明不完整的证明过程如下,请你帮他补充完整.
(2)【类比探究】如图(2),当k≠2时,求
的值(用含k的式子表示);
(3)【拓展运用】如图(3),当k=3时,P为边CD上一点,连接AP,PF,∠PAE=45°,
,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4645b6368eae25e9ecede56e45a8459.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/bcddbed5-6677-42a7-9b9f-67aaf5322d4b.png?resizew=639)
(1)【特例证明】如图(1),当k=2时,求证:AE=EF;
小明不完整的证明过程如下,请你帮他补充完整.
证明:如图,在BA上截取BH=BE,连接EH.![]() ∵k=2, ∴AB=BC. ∵∠B=90°,BH=BE, ∴∠1=∠2=45°, ∴∠AHE=180°-∠1=135°. ∵CF平分∠DCG,∠DCG=90°, ∴∠3= ![]() ∴∠ECF=∠3+∠4=135°. ∴…… (只需在答题卡对应区域写出剩余证明过程) |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114a2e56d9a32e3886fd517a85ede50d.png)
(3)【拓展运用】如图(3),当k=3时,P为边CD上一点,连接AP,PF,∠PAE=45°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3864fbf8f38f0285c22abbd5e31f8d15.png)
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解答题-作图题
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【推荐1】如图,在边长为1个单位的正方形网格中,
经过平移后得到
,图中标出了点B的对应点
.
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981200371916800/3080757748285440/STEM/7734b5b11b31422aad3ec69a237d45e7.png?resizew=289)
(1)画出
;
(2)
的面积=______;
(3)连接
、
,那么
与
的关系是______,线段AC扫过的图形的面积为______.
(4)在AB的右侧确定格点Q,使
的面积和
的面积相等,这样的Q点有______个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
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![](https://img.xkw.com/dksih/QBM/2022/5/17/2981200371916800/3080757748285440/STEM/7734b5b11b31422aad3ec69a237d45e7.png?resizew=289)
(1)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
(4)在AB的右侧确定格点Q,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
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【推荐2】如图,在边长为1的正方形网格中,△ABC的顶点均在格点上,建立平面直角坐标系后,点 A的坐标为(-4,1),点B的坐标为(-1,1),点C的坐标为(-1,3).
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949630802378752/2952361204023296/STEM/d220d898-af1d-4353-a404-dedc912f3cdd.png?resizew=257)
(1)画出:
①△ABC绕原点O顺时针旋转90°后得到的△A1B1C1;
②画出△ABC关于原点O对称的△A2B2C2.
(2)求△ABC绕原点O顺时针旋转90°的过程中,AB边所扫过区域的面积
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949630802378752/2952361204023296/STEM/d220d898-af1d-4353-a404-dedc912f3cdd.png?resizew=257)
(1)画出:
①△ABC绕原点O顺时针旋转90°后得到的△A1B1C1;
②画出△ABC关于原点O对称的△A2B2C2.
(2)求△ABC绕原点O顺时针旋转90°的过程中,AB边所扫过区域的面积
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【推荐1】如图,在平面直角坐标系内,已知抛物线
与
轴交于
,
两点,与
轴交于点
.
的值;
(2)如图1,点
为第一象限抛物线上的点,连接
.当
时,求点
的坐标;
(3)如图2,点
在
轴负半轴上,
,点
为抛物线上一点,
.点
分别为
的边
上的动点,且
,记
的最小值为
.求
的值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f3c6f5564c222a007e63b68b69c8ef.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83106b1437d49c4e4326d6a1bd8f559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1863a4f69bcba5db8f029273e3e96b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7869b716e6c2bd1e4b5e2bb9bedabe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab142c659d5434d88d7f6f5d994cfd18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44afdcc9a4285d9d090c7e94bc18e256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710d57694240738cbc8b73f38ca90443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf000ea818135424146cdbc6cdec32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图1,在平面直角坐标系中,直线AB与y轴交于点
,与x轴交于点B,
,直线CD与y轴交于点D,与x轴交于点
,
,直线AB与直线CD交于点Q,E为直线CD上一动点,过点E作x轴的垂线,交直线AB于点M,交x轴于点N,连接AE、BE.
求直线AB、CD的解析式及点Q的坐标;
当E点运动到Q点的右侧,且
的面积为
时,在y轴上有一动点P,直线AB上有一动点R,当
的周长最小时,求点P的坐标及
周长的最小值.
在
问的条件下,如图2将
绕着点B逆时针旋转
得到
,使点M与点G重合,点N与点H重合,再将
沿着直线AB平移,记平移中的
为
,在平移过程中,设直线
与x轴交于点F,是否存在这样的点F,使得
为等腰三角形?若存在,求出此时点F的坐标;若不存在,说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb902b95c0d3ee1a1071c9125ef3f50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8de72593f01c32e6433fc23626ee2b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2607e756ca0899f8cf1c53b702b1f22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e0e8c3310c88ac5b66503f39e07d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d735a2add9e860fed163d9b3c2469a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d735a2add9e860fed163d9b3c2469a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e5bd356dc1e3c01cc7a378536b24dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d4ed7c698dba1f3982cd74a40efcb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d4ed7c698dba1f3982cd74a40efcb3.png)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170148120674304/2171118914854912/STEM/55bbeb6b762e48588e84a68861e85d27.png?resizew=62)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170148120674304/2171118914854912/STEM/b21f09f945da41c89155cbab68d1f65c.png?resizew=33)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170148120674304/2171118914854912/STEM/81bd462ea70047f7961ed13da047cea6.png?resizew=58)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170148120674304/2171118914854912/STEM/c184aa8ca6574b6288cd03096ab093be.png?resizew=446)
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