如图,菱形ABCD的对角线AC和BD交于点O,分别过点C、作CE
BD,DE
AC,CE和DE交于点E
![](https://img.xkw.com/dksih/QBM/2022/3/26/2944719651266560/2945796454236160/STEM/7f894ee4638a4bd8b85e8292061cbf86.png?resizew=220)
(1)求证:四边形ODEC是矩形;
(2)当∠ADB=60°,AD=10时,求CE和AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/3/26/2944719651266560/2945796454236160/STEM/7f894ee4638a4bd8b85e8292061cbf86.png?resizew=220)
(1)求证:四边形ODEC是矩形;
(2)当∠ADB=60°,AD=10时,求CE和AE的长.
18-19八年级下·河北唐山·期中 查看更多[11]
河北省唐山市古冶区2018-2019学年八年级下学期期中数学试题2022年北京市朝阳区中考数学模拟试题(2)浙江省宁波市北仑区2021-2022学年八年级下学期期中数学试题浙江省宁波市精准联盟2021-2022学年八年级下学期期中数学试题湖北省十堰市郧阳区2021-2022学年八年级下学期期中数学试题(已下线)专题16 特殊的平行四边形-5年(2018~2022)中考1年模拟数学分项汇编(北京专用)2023年新疆乌鲁木齐市天山区八一中学中考数学一模试卷2023年新疆乌鲁木齐市八一中学九年级第一次质量检测(一模)数学试卷(已下线)专题04平行四边形(知识串讲+热考题型+专题训练)-2022-2023学年八年级数学下学期期中期末考点大串讲(人教版)(已下线)期中平行四边形、菱形、矩形、正方形的判定与性质证明题专训40题-2022-2023学年八年级数学下册同步考点知识清单+例题讲解+课后练习(人教版)(已下线)专题03 平行四边形【10个考点知识梳理+题型解题方法+专题过关】-2022-2023学年八年级数学下册同步考点知识清单+例题讲解+课后练习(人教版)
更新时间:2022-03-28 09:01:08
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,矩形
中,
,E是
上一点,
,连接
.点P从点E出发,沿
方向向点B匀速运动,同时点Q从点C出发,在
的延长线上匀速运动,P,Q的运动速度均为
.连接
交
于F,设点P,Q的运动时间为
.
?
(2)设四边形
的面积为
,求y与t之间的函数关系式.
(3)是否存在某一时刻t,使得
?若存在,求出t的值;若不存在,请说明理由.
(4)过点P作
于G,在P,Q运动过程中,线段
的长度是否发生变化?若变化,说明理由;若不变化,求出线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce8eadef29d42c50ca871e52f4827d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d590d88fe7eacfaa2d09690409ba8021.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/984ec72f6892e4363dcafa453c513217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46897b00156b15d182d507a05184923e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddffd38b20fe41a4fbcb8151366ca7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561335d2b27ca584ef2e3db326d55bf5.png)
(2)设四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49799251976c2dd944dd748ef3554d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012b14b48c09eb820c49c13dccb642bb.png)
(3)是否存在某一时刻t,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a27f07cc52159d27fc8f35aee9b5f8.png)
(4)过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd07e560c6935cb6e9e4c247a0d9ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】我们定义:如果一个三角形一条边上的高等于这条边,那么这个三角形叫做“等高底”三角形,这条边叫做这个三角形的“等底”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/0bd8c0e2-0a98-40c8-bac0-be7de7a23413.png?resizew=585)
(1)【概念理解】如图1,在7×7的方格纸中,线段
的端点都在格点上,请在所给的方格图中画出
,使
为“等高底”三角形,且点C在格点上(画出一个即可):
(2)【概念理解】如图2,在
中,
,
,
,试判断
是否是“等高底”三角形,请说明理由.
(3)【问题探究】如图3,
是“等高底”三角形,
是“等底”,作
关于
所在直线的对称图形得到
,连接
交直线
于点D.若点B是
的重心,求
的值.
(4)【应用拓展】如图4,
OAB中,点B的坐标为(0,2),点A在射线y=
x(x≥0)上,若
是“等高底”三角形,求点A的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/0bd8c0e2-0a98-40c8-bac0-be7de7a23413.png?resizew=585)
(1)【概念理解】如图1,在7×7的方格纸中,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)【概念理解】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)【问题探究】如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
(4)【应用拓展】如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,过
边
的中点
,作
,交
于点
,过点
作
,与
的延长线交于点
,连接
,
,若
平分
,
于点
.
(1)求证:
①
,
②四边形
是矩形;
(2)若
,求
的长.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b836a0f9c491f85767e8f6695576fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d1e017f4699e5e9edf409aa3c5265f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ff26eeabfaef6e944082999e39e814.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/12/28/2631081895772160/2634533394350080/STEM/acce8695-8166-4220-b026-9349854994e0.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
(2)在(1)的条件下,若
,AB=1,添加条件AE=______时,
为矩形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fc9f894312e55c87a0d6737080e233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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解答题-问答题
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适中
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【推荐1】如图,在平面直角坐标系中,点A,C分别在x轴,y轴的正半轴上,四边形OABC是正方形,点
在边AB上,连接OE,作
于点E,分别交x轴,BC于点D,F.
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991389821427712/2994709225873408/STEM/437ed080-aa96-4205-ab35-f3be0bb8145b.png?resizew=189)
(1)求
的值;
(2)求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9433bf9c29c2a606923a3fc1d1c9aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77eda028051b34e285ffc1434540b662.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991389821427712/2994709225873408/STEM/437ed080-aa96-4205-ab35-f3be0bb8145b.png?resizew=189)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120737593aa43440f8461d0421ca33e9.png)
(2)求点F的坐标.
您最近一年使用:0次
解答题-计算题
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适中
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【推荐2】清渭楼也被称为“咸阳楼”,位于咸阳市区的渭河北岸,曾经被誉为“西北第一楼”.在确保安全的前提下,数学兴趣小组想利用所学知识测量清滑楼
的高,如图所示,他们先在地面A处测得楼顶E的仰角
为
,再在A处搭建21米的高台
进行测量,在D处测得楼顶E的仰角为
,其中
,
,请你根据以上信息帮助他们计算清渭楼
的高.(参考数据:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8723a60dcf19d4f360a44e34652655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ad07b15b42f9d1198e649c548f7310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a272d2f107698a2073404e09155641b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef8d4792c62c0dcf35004df43a25d5d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8723a60dcf19d4f360a44e34652655.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/f8d02b14-7160-4665-9ae3-0e6e6cf31389.jpg?resizew=214)
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,在菱形
中,
,垂足为点E,请按要求在图中仅用无刻度的直尺画图.
(1)在图1中,画出线段
的中点M;
(2)在图2中,过点C画出
边上的高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
(1)在图1中,画出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)在图2中,过点C画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584866661982208/2584937724805120/STEM/917f6410-e541-4f2f-b8cf-3be08889ab36.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,
的顶点均为格点,
与网格线交于点
.仅用无刻度尺的直尺在网格中画图,画图过程用虚线表示,画图结果用实线表示.
(1)如图1,画出
的角平分线
;
(2)如图1,平移
至
,使点
的对应点为点
;
(3)如图2,在
上找一点
,使
最小;
(4)如图3,
与网格线交于点
,过点
作
于
.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/d36a0b38-6f09-4dbe-bb74-de8d276aa5f7.png?resizew=750)
(1)如图1,画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图1,平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1ee273935a47cef00b3fe08d1e503c.png)
(4)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3415f19a0eae209581610093b4c0232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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