如图,四边形区域是音乐广场的一部分,现在要在这一区域内建一个喷泉,要求喷泉到两条道路
的距离相等,且到入口A,C的距离相等.
(2)请写出作图依据__________________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d071d008cdc313f6ed16a602f8a9669.png)
(2)请写出作图依据__________________.
更新时间:2024-05-21 22:07:55
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【推荐1】如图,在△ABC中,AB=BC,∠ABC=84°,点D是AC的中点,DE∥BC,求∠EDB的度数.
![](https://img.xkw.com/dksih/QBM/2019/6/5/2219266414608384/2227795429720064/STEM/cb2b1fc1003c41458b09ef01dad70aa5.png?resizew=146)
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解答题-问答题
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【推荐2】在
中,
的平分线
与外角
的平分线
所在的直线交于点
.
(1)如图
,若
,求
的度数;
(2)如图
,把
沿
翻折,点
落在
处.
当
时,求
的度数;
试确定
与
的数量关系,并说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/bbe519ba-1a9d-4463-81d9-18711fe9537c.png?resizew=344)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33db2eb32219cbbf56a3ad6bb4ead17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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【推荐1】如图,以
点为圆心,以相同的长为半径作弧,分别与射线
交于
两点,连接
,再分别以
为圆心,以相同长(大于
)为半径作弧,两弧相交于点
,连接
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d42cb68c5c877a455ba7ac0a6b6a651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d3055b122bf4953a3d6cc92ab03d74.png)
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解答题-作图题
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【推荐2】规作图:如图,射线OM⊥射线ON,A为OM上一点,请以OA为一边作两个大小不等的等腰直角三角形.保留作图痕迹,标上顶点字母,并写出所画的三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/31eedd2f-1131-496e-bb9b-67b709443475.png?resizew=480)
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名校
【推荐1】如图,
中,
垂直平分
垂直平分
,垂足分别为E、G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/2b4ea20c-2c53-49d8-900c-595b4aea5ed6.png?resizew=204)
(1)若
的周长为16,求
的长;
(2)若
,则
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cf5334c78c8188c558aaa20b071893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/2b4ea20c-2c53-49d8-900c-595b4aea5ed6.png?resizew=204)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592849d99e570c23906687097b1072ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe96359b3d85c42aa931a199e0c2cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad75bdd17013af544fc97ab1dcecb873.png)
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解答题-证明题
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【推荐2】如图,△ABC中,AC的垂直平分线MN交AB于点D,交AC于点O,CE
AB交MN于E,连结AE、CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/2a105e39-cc94-4a81-b310-735efb5e7848.png?resizew=149)
(1)求证:AD=CE;
(2)求证:四边形ADCE是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7003aee0b4b85f0fdd48ca9ae5826d54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/2a105e39-cc94-4a81-b310-735efb5e7848.png?resizew=149)
(1)求证:AD=CE;
(2)求证:四边形ADCE是菱形.
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【推荐1】如图,已知美团外卖骑手沿着直线街道
由商家处向买家处行驶,点
分别代表街道两侧的两个小区.
![](https://img.xkw.com/dksih/QBM/2020/11/12/2591297613447168/2591576945360896/STEM/ac8be0219b6e46ad9f6d3eb614687e0b.png?resizew=318)
(1)该骑手行驶到街道的什么位置时与
两小区的距离之和最短?该骑手行驶到街道的什么位置时分别离
小区最近?请在街道
上画出上述位置,并写出画图依据;
(2)在(1)的作图基础上分析:当骑手由
处向
处行驶时,哪一段路距离
两小区都越来越近?哪一段路距离
小区越来越近而距离
小区越来越远?
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://img.xkw.com/dksih/QBM/2020/11/12/2591297613447168/2591576945360896/STEM/ac8be0219b6e46ad9f6d3eb614687e0b.png?resizew=318)
(1)该骑手行驶到街道的什么位置时与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在(1)的作图基础上分析:当骑手由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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真题
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【推荐2】在学习矩形的过程中,小明遇到了一个问题:在矩形
中,
是
边上的一点,试说明
的面积与矩形
的面积之间的关系.他的思路是:首先过点
作
的垂线,将其转化为证明三角形全等,然后根据全等三角形的面积相等使问题得到解决.请根据小明的思路完成下面的作图与填空:
作
的垂线
,垂足为
(只保留作图㾗迹).
在
和
中,
∵
,
∴
.
又
,
∴__________________①
∵
,
∴__________________②
又__________________③
∴
.
同理可得__________________④
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d7ec82a77592ddfec9784f7a203352.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d696a94ef8ea8e5887eb27d590483849.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
∴__________________①
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴__________________②
又__________________③
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648c656bdf98a11b2bb0862efb5d77c0.png)
同理可得__________________④
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e102122b245ff7e43657ae38597293.png)
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解答题-作图题
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名校
【推荐3】下面是小明同学设计的“已知底边及底边上的中线作等腰三角形”的尺规作图过程.
已知:如图1,线段a和线段b.
求作:
,使得
,
,
边上的中线为b.
作法:如图2,
①作射线
,并在射线
上截取
;
②作线段
的垂直平分线
,
交
于D;
③以D为圆心,b为半径作弧,交
于A;
④连接
和
.
则
为所求作的图形.
根据上述作图过程,回答问题:
(2)完成下面的证明:
证明:由作图可知
,
.
∵
为线段
的垂直平分线,点A在
上,
∴
( )(填依据).
又∵线段
的垂直平分线
交BC于D,
∴ = .
∴
为
边上的中线,且
.
已知:如图1,线段a和线段b.
求作:
![](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/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
作法:如图2,
①作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
②作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
③以D为圆心,b为半径作弧,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
根据上述作图过程,回答问题:
(2)完成下面的证明:
证明:由作图可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b857c7ca55dfa6da108df1d3cee2.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
又∵线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
∴ = .
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c52b857c7ca55dfa6da108df1d3cee2.png)
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