名校
1 . 如图,
,
均为等腰直角三角形,
,
,
,H为
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/2023/6/13/3258992502546432/3259421849927680/STEM/8fdd02aa625040a19231e5e0d27a18f4.png?resizew=165)
(1)尺规作图:求作点F,使得
,
,点F在
下方;
(2)在(1)的条件下,求证:E,H,F三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f302a858828fef1d2b1323fbb6ffed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2023/6/13/3258992502546432/3259421849927680/STEM/8fdd02aa625040a19231e5e0d27a18f4.png?resizew=165)
(1)尺规作图:求作点F,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a87efa1454c6082c9168c66b5a129f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e115fc47fc278c1a962766f29efd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)在(1)的条件下,求证:E,H,F三点共线.
您最近一年使用:0次
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2 . 我们学习过利用尺规作图平分一个任意角,而“利用尺规作图三等分一个任意角”曾是数学史上一大难题,之后被数学家证明是不可能完成的.人们根据实际需要,发明了一种简易操作工具-三分角器.图1是它的示意图,其中
与半圆O的直径
在同一直线上,且
的长度与半圆的半径相等,
与
垂直与点B,
足够长.
使用方法如图2所示,若要把
三等分,只需适当放置三分角器,使
经过
的顶点E,点A落在边
上,半圆O与另一边
恰好相切,则
,
就把
三等分了.
为了说明这一方法的正确性,需要对其进行证明.如下给出了不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
已知:如图2,点A,B,O,C在同一直线上,
,垂足为点B, .
求证: .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/da9f9616-134b-42f3-ac1c-0c64f794ba6f.png?resizew=328)
使用方法如图2所示,若要把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f30095577dc714634354f5ad27715.png)
为了说明这一方法的正确性,需要对其进行证明.如下给出了不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
已知:如图2,点A,B,O,C在同一直线上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ad7c46b97fbb2c7934636f6f1dc244.png)
求证: .
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3 . 尺规作图并完成证明:
如图,点C是
上一点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/c72808d1-f2c4-4a3f-96f3-2c9a32ad64dd.png?resizew=184)
(1)尺规作图:过点C作
的垂线
,交
于点F;
(2)证明:
.
证明:∵
,∴ ① .
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
在
和
中,
,
∴
.
∴ ③ .
又∵
,
∴
( ④ ).
如图,点C是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1120e471627069e78a6733af07687684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8292ee917974ead96b5176ba3faf8bb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/c72808d1-f2c4-4a3f-96f3-2c9a32ad64dd.png?resizew=184)
(1)尺规作图:过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8292ee917974ead96b5176ba3faf8bb0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5b691b45d3bc32e2678ffe1b8af5fd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba1b833268486fff262ee55ede02d9e.png)
∴ ③ .
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cc087c22e1fc1197236c71e5465d33.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
您最近一年使用:0次
2023-04-17更新
|
210次组卷
|
2卷引用:重庆市万州区万州第一中学2022-2023学年九年级下学期期中数学试题
4 . 如图,
是
的内接三角形,
,D为
的弧
上一点,延长
至点E,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/f0301b0c-61f5-497e-807d-2288dd9644b3.png?resizew=285)
(1)求证:
;
(2)若
,试说明
、
与
之间是否存在某种确定的等量关系?请画图(非尺规作图),写出你的结论并证明.
(3)若
,则
_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/f0301b0c-61f5-497e-807d-2288dd9644b3.png?resizew=285)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18580fb5f1fe64c003840fb703c22d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
您最近一年使用:0次
2023-01-13更新
|
90次组卷
|
2卷引用:浙江省丽水市莲都区文元教育集团2022-2023学年九年级上学期期中数学试题
名校
5 . 尺规作图:过圆外一点作圆的切线按照下面描述,完成尺规作图:
(1)连接
,交圆O于点A,以O为圆心,
长为半径画圆;
(2)过点A作
的垂线,交以O为圆心
为半径的圆O于点B,连接
,交以O为圆心
为半径的圆O于点M.
(3)连接
,即为所求.
可证
______,则
_______.则
为圆O的切线,依据是_________.
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
可证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76106db52d956bf4c58d969c64e1f948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1448d68e57e406720790e2046d9a01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/5859a279-ea3e-4b1f-8e75-e891c33453fb.png?resizew=110)
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6 . 尺规作图:已知,在Rt△ABC中,
,
.在
上求作点
,使得点
到
的距离等于D到边AC距离的
倍.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/cd2c4a99-fec2-4c49-9393-8c6554740b36.png?resizew=118)
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2022-09-10更新
|
110次组卷
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2卷引用:2022年陕西省西安市爱知中学九年级下学期诊断六数学试题
名校
7 . 以下图形中,根据尺规作图痕迹,不能判断射线
平分
的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/23/2970096872947712/2985702980042752/STEM/c498116d-1195-4d7b-9e7a-301b555931e7.png?resizew=533)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2022/4/23/2970096872947712/2985702980042752/STEM/c498116d-1195-4d7b-9e7a-301b555931e7.png?resizew=533)
A.① | B.② | C.③ | D.④ |
您最近一年使用:0次
2022-05-23更新
|
501次组卷
|
9卷引用:2022年浙江省衢州市江山、龙游、柯城第一次模拟考试数学试题
2022年浙江省衢州市江山、龙游、柯城第一次模拟考试数学试题(已下线)2022年浙江省舟山市中考数学变式题1-52021年新疆乌鲁木齐市实验学校中考第一次模拟考试数学试卷(已下线)第二节 尺规作图01技法提练(已下线)第6课 尺规作图-【帮课堂】2022-2023学年八年级数学上册同步精品讲义(浙教版)(已下线)重难点02 尺规作图 (5种题型)-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)浙江省舟山市属校2021-2022学年八年级下学期期末联考数学试题 (已下线)第4章 几何图形初步单元复习测试卷-2022-2023学年七年级数学上册《同步考点解读·专题训练》(人教版)湖北省恩施市2022-2023学年八年级上学期数学期末考试题卷
8 . 我们学习过利用尺规作图平分一个任意角,而“利用尺规作图三等分一个任意角”曾是数学史上一大难题,之后被数学家正明是不可能完成的.人们根据实际需要,发明了一种简易操作工具—“三分角器”.图1是它的示意图,其中如与半圆O的直径BC在同一直线上,且AB的长度与半圆的半径相等;DB与AC垂直于点B,DB足够长.使用方法如图2所示,若要把∠MEN三等分,只需适当放置三分角器,使DB经过∠MEN的顶点E,点A落在边EM上,半圆O与另一边EN恰好相切,切点为F,则EB,EO就把∠MEN三等分了.为了说明这一方法的正确性,需要对其进行证明.如下给出了不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
已知:如图2,点A,B,O,C在同一直线上,
,垂足为点B,半圆O与EN相切于点F, .
求证:EB,EO是∠MEN三等分线.
已知:如图2,点A,B,O,C在同一直线上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ad7c46b97fbb2c7934636f6f1dc244.png)
求证:EB,EO是∠MEN三等分线.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957179607465984/2960967191183360/STEM/a5bfc4db-c18e-4108-a1c1-a7930d7df0fa.png?resizew=377)
您最近一年使用:0次
9 . 如图,已知△ABC中,BD是中线.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901404095913984/2901507258990592/STEM/64ae6ce0-3bf3-4771-b301-ba3d623cdbfa.png?resizew=227)
(1)尺规作图:作出以D为对称中心,与△BCD成中心对称的△EAD.
(2)猜想AB+BC与2BD的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/24/2901404095913984/2901507258990592/STEM/64ae6ce0-3bf3-4771-b301-ba3d623cdbfa.png?resizew=227)
(1)尺规作图:作出以D为对称中心,与△BCD成中心对称的△EAD.
(2)猜想AB+BC与2BD的大小关系,并说明理由.
您最近一年使用:0次
2022-01-24更新
|
412次组卷
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5卷引用:广东省广州市南沙区2021-2022学年九年级上学期期末数学试题
广东省广州市南沙区2021-2022学年九年级上学期期末数学试题(已下线)23.2.2 中心对称图形(分层练习)-2022-2023学年九年级数学上册同步精品课堂(人教版)(已下线)专题23.11 旋转(全章知识梳理与考点分类讲解)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)(已下线)9.2 中心对称与中心对称图形(练习)-2022-2023学年八年级数学下册同步精品课堂(苏科版)(已下线)第3章 图形的平移与旋转(单元测试·培优卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
名校
10 . 如图,锐角
ABC中,AD平分∠BAC交BC于点D
(1)尺规作图:作AD的垂直平分线交AB于点E,交AC于点F,连接DE,DF;
(2)证明(1)中的四边形AEDF是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)尺规作图:作AD的垂直平分线交AB于点E,交AC于点F,连接DE,DF;
(2)证明(1)中的四边形AEDF是菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/0f261a7e-aa21-4c57-a42c-fa359ff16d38.png?resizew=160)
您最近一年使用:0次
2021-11-21更新
|
351次组卷
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2卷引用:山西省太原市2021-2022学年九年级上学期期中数学试题