如图(1),凸四边形
,如果点
满足
.且
,则称点
为四边形
的一个半等角点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/63e69bbd-8f24-43a6-9234-f43c876ea4c0.png?resizew=391)
(1)在图(3)正方形
内画一个半等角点
,且满足
;
(2)在图(4)四边形
中画出一个半等角点
,保留画图痕迹(不需写出画法);
(3)若四边形
有两个半等角点
、
(如图(2)
,证明线段
上任一点也是它的半等角点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1c69130c7c70ddcd07a4b4a1156024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ac60a6dcdea0785c73c6eede719d48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/63e69bbd-8f24-43a6-9234-f43c876ea4c0.png?resizew=391)
(1)在图(3)正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b68947b00b0cbdfe57ceda72ed09e59.png)
(2)在图(4)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
11-12八年级下·浙江绍兴·期中 查看更多[4]
(已下线)2011-2012学年浙江绍兴杨汛桥中学八年级下学期期中考试数学试卷江苏省扬州市江都区实验中学、刊江区实验中学2017-2018学年八年级上学期第一次联考数学试题(已下线)【万唯原创】安徽省2017年中考数学-面对面-正文热点题型-第二部分题型八13.1轴对称
更新时间:2016-12-05 08:42:51
|
相似题推荐
解答题-证明题
|
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名校
【推荐1】如图,在四边形中,
,
平分
,
,垂足为
,且
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad127f326eaab5bf469887e42762de1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7383dc47586a63428fd1a2aea81003c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9290b887e88e8d2fd774a7314e2ca73a.png)
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【推荐2】阅读下面材料:
小明遇到这样一个问题:如图
,在
中,
为
中点,
、
分别为
、
上一点,且
,求证:
.
小明发现,延长
到点
,使
,连接
、
,构造
和
,通过证明
与
全等、
为等腰三角形,利用
使问题得以解决
如图
.
参考小明思考问题的方法,解决问题:
如图
,在矩形
中,
为对角线
中点,将矩形
翻折,使点
恰好与点
重合,
为折痕,猜想
、
、
之间的数量关系?并证明你的猜想.
小明遇到这样一个问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2890dacb8b705263694499ac5356aad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74aa9a5332ccc8993faa3074ca643224.png)
小明发现,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5251f233a6bec28a760259f9881006f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d46533a8a50603ffe46bc5c5efd42c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a019625b21ba728a67a3f6437709ace4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d46533a8a50603ffe46bc5c5efd42c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a019625b21ba728a67a3f6437709ace4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc5c12b241539cc99487865f7d8bf34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad217e26bd3580c35998109de14cef73.png)
参考小明思考问题的方法,解决问题:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/dbdae8c0-e6ba-468d-8ac8-9ffd498f2df0.png?resizew=467)
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【推荐3】如图,在
ABC中,∠C=90°,边BC上有一点D,BD=AC,过点D作DE⊥AB,垂足为点E,过点B作BF∥AC,交DE的延长线于点F,求证:AB=DF.
证明:
∵BF∥AC,∠C=90°
∴∠FBD=180°﹣∠C=90° ( );
∵DE⊥AB
∴∠BED=90° ( );
∴∠ABC+∠EDB=90°
∵∠ABC+∠A=90°
∴∠A=∠EDB ( );
在
ABC和
DFB中,
∵∠A=∠EDB, = ,∠C=∠FBD,
∴
ABC≌
DFB ( );
∴AB=DF ( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
证明:
∵BF∥AC,∠C=90°
∴∠FBD=180°﹣∠C=90° ( );
∵DE⊥AB
∴∠BED=90° ( );
∴∠ABC+∠EDB=90°
∵∠ABC+∠A=90°
∴∠A=∠EDB ( );
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
∵∠A=∠EDB, = ,∠C=∠FBD,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
∴AB=DF ( ).
![](https://img.xkw.com/dksih/QBM/2020/7/3/2497692560760832/2498039415767040/STEM/22dc618547014739a22e0abef88e38f5.png?resizew=155)
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解答题-作图题
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【推荐1】如图:直线m表示一条公路,A、B表示两所大学.要在公路旁修建一个车站P使到两所大学的距离相等,请在图上找出这点P.(尺规作图,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/70e1c69f-1719-4d8b-aa9a-7df1ef97868d.png?resizew=169)
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【推荐2】如图,线段
绕点
顺时针旋转一定的角度得到线段
.
(1)用直尺和圆规作出旋转中心
(不写作法,保留作图痕迹);
(2)连接
、
、
、
,添加一定的条件,可以求出线段
扫过的面积.(不再添加字母和辅助线,线段的长可用
、
、
…表示,角的度数可用
、
、
…表示).你添加的条件是________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fde9d5b268f90278bd0fa652d95784.png)
(1)用直尺和圆规作出旋转中心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1bc55324b15fc7e5d469650dc25e590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7be082aa72a5306ae958621f8ccc8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296cf79e9d15507b260ef07925c190e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daaf46bc163174dc4c7af3376bfb3508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b331bbdd68d110681fc4547748b93bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4e63a482a0bb3be6d670ab6f2635db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaab0619213938b7f55769c7540abdf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e514bc1761deff47d27c1909c1906ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53ae9d2cb4f0724affa29fee3cc458e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5008a63181eb50a7b0234d4d0e260f83.png)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074582580166656/2075388780552192/STEM/84b5e4741a53433a95bb15f8c9141da8.png?resizew=157)
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【推荐1】如图,已知一次函数
的图像与x轴、y轴分别交于点B、A,以
为边在第一象限内作正方形
.过点C作
轴于点E,点
是线段
上的动点,过点G作
轴分别交
于点F、H,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/c4769a2d-36e3-4b98-8f74-3dac75b0791e.png?resizew=171)
(1)求点C的坐标.
(2)当
时,判断四边形
的形状,并说明理由.
(3)当
时,请直接写出点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de869ae6b6dc5b79fcae3de540b30bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e6dc08b0ba0a0bf43d9395da447b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6568bad036eba6ca51d3cbb0871d11f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4c5119c63ea86e97ad2ac7c84a423b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82d579a717399137b8c6d475d33cd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/c4769a2d-36e3-4b98-8f74-3dac75b0791e.png?resizew=171)
(1)求点C的坐标.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42a206263c26a0a8b0cf97594ada7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76573718ac1b3581dd3eff88dd294cc6.png)
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【推荐2】如图,四边形ABCD为正方形,连接AC.
(1)请用尺规作图法在边BC上求作一点P,使得点P到AC的距离等于BP的长度. (保留作图痕迹,不写作法)
(2)若正方形ABCD的边长为4,求(1)中所得的BP的长
(1)请用尺规作图法在边BC上求作一点P,使得点P到AC的距离等于BP的长度. (保留作图痕迹,不写作法)
(2)若正方形ABCD的边长为4,求(1)中所得的BP的长
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/47b377d4-e181-468a-be4d-62ed300a39a6.png?resizew=102)
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【推荐3】如图,在锐角三角形ABC中,
,BC边上的高AM=6,D,E分别是边AB,AC上的两个动点(D不与
,
重合),且保持DE∥BC,以DE为边,在点
的异侧作正方形DEFG.
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/af6d900ebe434e8e8c6a3a0ad447e25c.png)
(1)因为 ,所以△ADE∽△ABC.
(2)如图1,当正方形DEFG的边GF在BC上时,求正方形DEFG的边长;
(3)设DE = x,△ABC与正方形DEFG重叠部分的面积为y.
①如图2,当正方形DEFG在△ABC的内部时,求
关于
的函数关系式,写出x的取值范围;
②如图3,当正方形DEFG的一部分在△ABC的外部时,求
关于
的函数关系式,写出x的取值范围;
③当x为何值时,y有最大值,最大值是多少?
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/012bc6a72c2f49cdbe93a749c27cb3d5.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/4b172923dd0c4791ac265d88835d87cf.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/2dd62807f1de4c418efe6a387ea214d7.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/4b172923dd0c4791ac265d88835d87cf.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/af6d900ebe434e8e8c6a3a0ad447e25c.png)
(1)因为 ,所以△ADE∽△ABC.
(2)如图1,当正方形DEFG的边GF在BC上时,求正方形DEFG的边长;
(3)设DE = x,△ABC与正方形DEFG重叠部分的面积为y.
①如图2,当正方形DEFG在△ABC的内部时,求
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/f58187f7e5bb4c57b19353b5210d1172.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/53a42cfe599744c5b8bfc258100ec144.png)
②如图3,当正方形DEFG的一部分在△ABC的外部时,求
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/f58187f7e5bb4c57b19353b5210d1172.png)
![](https://img.xkw.com/dksih/QBM/2011/2/10/1577480944467968/1577481050144768/STEM/53a42cfe599744c5b8bfc258100ec144.png)
③当x为何值时,y有最大值,最大值是多少?
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