名校
1 . 在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/1136b1ca-931f-4d23-a8fd-a064f8d5134c.png?resizew=201)
(1)作BC的重直平分线,垂足为点D,与AB交于E点,连接EC(用尺规作图,不写作法,保留作图痕迹);
(2)若
,
,则
____________,
____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/1136b1ca-931f-4d23-a8fd-a064f8d5134c.png?resizew=201)
(1)作BC的重直平分线,垂足为点D,与AB交于E点,连接EC(用尺规作图,不写作法,保留作图痕迹);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d758ff40da90d1872c246469bf281c5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7a5de06d5577a27967d000e360e851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f594898ac298fb28edc09796ad3ca899.png)
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2 . 如图所示,
为
的直径,在
中,
,
交
于点
,过点
作
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985609555599360/3126292539269120/STEM/70b6e748349e4bbd8b30869e91f5959b.png?resizew=175)
(1)证明
是
的切线;
(2)
,
为
上一点,
到弦
的最大距离为8.
①尺规作图作出此时的
点,保留作图痕迹;
②求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985609555599360/3126292539269120/STEM/70b6e748349e4bbd8b30869e91f5959b.png?resizew=175)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①尺规作图作出此时的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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3 . 如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e1cab220-e3db-4ae4-b3d3-08b2818279cb.png?resizew=150)
(1)尺规作图:以AB为直径作⊙O分别交BC,AC于点D,E,连接EB,OD(保留作图痕迹,不写作法);
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e1cab220-e3db-4ae4-b3d3-08b2818279cb.png?resizew=150)
(1)尺规作图:以AB为直径作⊙O分别交BC,AC于点D,E,连接EB,OD(保留作图痕迹,不写作法);
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fdf76652849c76fae8fd5af9f74142.png)
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4 . 尺规作图:如图,已知AB是⊙O的直径.用两种不同的方法作圆的内接四边形ABCD,要求AB//CD且
.(不写作法,保留作图痕迹.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/d7db78f9-9021-4356-b4d6-615e22694ad5.png?resizew=358)
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5 . “无刻度直尺”是尺规作图的工具之一,它的作用在于连接任意两点、作任意直线、延长任意线段.结合图形的性质,只利用无刻度直尺也可以解决一些几何作图问题.
(1)如图,在平行四边形ABCD中,点E在AD边上,且
,连接CE.求证:CE是
的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/dcecc582-0793-44dc-bbde-2a8dc1d23ca2.png?resizew=167)
(2)如图,在平行四边形ABCD中,点E是BC的中点,请利用无刻度直尺作图(仅用无刻度直尺作图并保留作图痕迹,不写画法).
①在图1中,请过点E作AB的平行线交AD于点F.
②在图2中,请过点E作AC的平行线交AB于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/19889dd9-a845-48cc-9c5c-198601b17d63.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/7ce3a67b-5eb7-4b31-b999-61adf284c255.png?resizew=193)
(3)如图,点E、F分别在平行四边形ABCD的边上,
.连接DF,请过点A作DF的垂线,垂足为G(仅用无刻度直尺作图并保留作图痕迹,不写画法).
(1)如图,在平行四边形ABCD中,点E在AD边上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/dcecc582-0793-44dc-bbde-2a8dc1d23ca2.png?resizew=167)
(2)如图,在平行四边形ABCD中,点E是BC的中点,请利用无刻度直尺作图(仅用无刻度直尺作图并保留作图痕迹,不写画法).
①在图1中,请过点E作AB的平行线交AD于点F.
②在图2中,请过点E作AC的平行线交AB于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/19889dd9-a845-48cc-9c5c-198601b17d63.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/7ce3a67b-5eb7-4b31-b999-61adf284c255.png?resizew=193)
(3)如图,点E、F分别在平行四边形ABCD的边上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e141215945ce5a577753e82864964c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/b8d5d451-2e7e-473b-af9f-c42ba8b17524.png?resizew=181)
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6 . 如图,AB为圆O的直径,点C在圆O上.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988484782981120/2991297815429120/STEM/39082edb-e84f-4fc8-b880-bcaf559a994f.png?resizew=149)
(1)尺规作图:在BC上求作一点E,使
(不写作法,只保留作图痕迹);
(2)探究OE与AC的数量关系.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988484782981120/2991297815429120/STEM/39082edb-e84f-4fc8-b880-bcaf559a994f.png?resizew=149)
(1)尺规作图:在BC上求作一点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d927e9b22848c8e7a8a497870daaeb.png)
(2)探究OE与AC的数量关系.
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2022-05-31更新
|
321次组卷
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4卷引用:2022年甘肃省酒泉市肃州区中考适应性检测(二)数学试题
2022年甘肃省酒泉市肃州区中考适应性检测(二)数学试题2022年甘肃省酒泉中考适应性测试数学试卷(二) (已下线)专题24.44 《圆》中考常考考点专题-圆的基本性质(巩固篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)专题3.47 圆(中考常考考点专题 圆的基本性质)(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)
名校
7 . 已知在
中,
,现按如下步骤作图:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/4129155c-3794-4f25-85d8-4c0d08619621.png?resizew=187)
①分别以A,C为圆心,a为半径(
)作弧,两弧分别交于M,N两点;
②过M,N两点作直线
交
于点D,交
于点E;
(1)由尺规作图可知,直线
线段
的______.
(2)延长
至F,使
,求证:四边形
是平行四边形;
(3)当
______度时,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de36aec23d150489da9166675afc849b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee98db8495cf1f203abe99795102e20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/4129155c-3794-4f25-85d8-4c0d08619621.png?resizew=187)
①分别以A,C为圆心,a为半径(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6247583ecc14a5463ce7bee0376a99a1.png)
②过M,N两点作直线
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
(1)由尺规作图可知,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378eb33c93efb96c00b8eed93971aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211c130e20ea36d96e88927f88df956e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4991bf5a5672093bc485f16319fe76c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211c130e20ea36d96e88927f88df956e.png)
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2022-10-23更新
|
120次组卷
|
2卷引用:辽宁省沈阳市和平区第一三四中学2022-2023学年九年级上学期10月月考数学试题
8 . 如图,在△ABC中,D是BC边上一点,且BD=BA=13.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969374422056960/2974145177903104/STEM/6d55770e6c5144529091ef9d1a626710.png?resizew=263)
(1)尺规作图(保留作图痕迹,不写作法):
①作∠ABC的角平分线交AD于点E;
②作线段DC的垂直平分线交DC于点F.
(2)在(1)所作图形中,连接EF,已知AC=12,AD=10,CD=6,求△BEF的周长.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969374422056960/2974145177903104/STEM/6d55770e6c5144529091ef9d1a626710.png?resizew=263)
(1)尺规作图(保留作图痕迹,不写作法):
①作∠ABC的角平分线交AD于点E;
②作线段DC的垂直平分线交DC于点F.
(2)在(1)所作图形中,连接EF,已知AC=12,AD=10,CD=6,求△BEF的周长.
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2022-05-07更新
|
408次组卷
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7卷引用:2022年重庆市九龙坡区九年级中考适应性考试数学试题
2022年重庆市九龙坡区九年级中考适应性考试数学试题(已下线)数学-2022年云南中考考前押题密卷(含考试版、全解全析、答题卡)(已下线)数学-2022年广东省广州市中考考前押题密卷(含考试版、全解全析、答题卡)(已下线)专题18.9 三角形的中位线(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题4.15 三角形的中位线(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题19.12 三角形的中位线(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(沪科版)(已下线)专题6.9 三角形的中位线(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
9 . 如图,在△ABC中,AD是BC边上的中线,以AB为直径的⊙O交BC于点D,过点D作直线DE⊥AC于点E
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/beac5fc6-f125-4eb2-b028-1805fac1082f.png?resizew=209)
(1)求证,直线DE是⊙O的切线;
(2)尺规作图:过点B作直线DE的垂线,垂足为点F,(不写作法,保留作图痕迹);
(3)若⊙O的半径为5,AD=8,求BF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/beac5fc6-f125-4eb2-b028-1805fac1082f.png?resizew=209)
(1)求证,直线DE是⊙O的切线;
(2)尺规作图:过点B作直线DE的垂线,垂足为点F,(不写作法,保留作图痕迹);
(3)若⊙O的半径为5,AD=8,求BF的长.
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10 . 求证:三角形的中位线平行于第三边,并且等于第三边的一半.
![](https://img.xkw.com/dksih/QBM/2022/2/8/2911836845056000/2937626643070976/STEM/2445d62f-9712-4f5d-9898-11f4098068e7.png?resizew=173)
(1)根据给出的
及AB边上的中点D,利用尺规作图作出AC边上的中点E;(不写作法,保留作图痕迹)
(2)连结DE,已知:如图,在
中,点D、E分别是AB与AC的中点.求证:
,且
,以上给出了已知、求证,请你完成证明过程.
![](https://img.xkw.com/dksih/QBM/2022/2/8/2911836845056000/2937626643070976/STEM/2445d62f-9712-4f5d-9898-11f4098068e7.png?resizew=173)
(1)根据给出的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)连结DE,已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
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