名校
1 . 如图,在
中,
,
,作线段
的垂直平分线,交
于点D,交
于点E.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](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)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9811b144b053df12261e59bdaf53847.png)
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2 . 阅读与思考:下面是小宇同学的数学日记,请仔细阅读并完成相应的任务.
任务:
(1)请你补全小宇日记中不完整的部分:①__________,②__________.
(2)尺规作图:在图2中作
的角平分线,交
于点
(保留作图痕迹,不写作法).
(3)在(2)的条件下,求线段
的长度.
×年×月×日 星期日 用等面积法解决问题 周末,我对本学期所学的内容进行了回顾与整理,发现数学中有许多方法是可以互相迁移的. 比如我们在学习整式乘法时,借助如图1所示的边长为 ![]() 再比如学习三角形的内容时,我遇到了同样可以用等面积法解决的问题.如图2,在 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 总结:等面积法是一种重要的数学解题方法,在解题中,灵活运用等面积法解决相关问题,不仅可以使解题思路清晰,过程简洁,而且还能体现知识间的相互联系. ![]() |
(1)请你补全小宇日记中不完整的部分:①__________,②__________.
(2)尺规作图:在图2中作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)在(2)的条件下,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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名校
3 . 乐乐发现,任意一个直角三角形都可以分割成两个等腰三角形,已知:在中,
.
求作:直线,使得直线
将
分割成两个等腰三角形.
下面是乐乐设计的尺规作图过程.
作法:如图,①作直角边的垂直平分线
,与斜边
相交于点
;
②作直线. 所以直线
就是所求作的直线.
根据乐乐设计的尺规作图过程,解决下列问题:
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)证明直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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4 . 下面是小李设计的“过圆外一点作圆的一条切线”的尺规作图的过程.
已知:如图1,
及圆外一点P.
求作:过点P作
的一条切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c579cb70-8eae-4896-b829-488557732639.png?resizew=205)
作法:①连接
;
②作
的垂直平分线,交
于点A;
③以A为圆心,
的长为半径作弧,交
于点B;
④作直线
.
即直线
为所求作的一条切线.
根据上述尺规作图的过程,回答以下问题:
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)该作图中,可以得到
______
;依据:____________.
已知:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求作:过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c579cb70-8eae-4896-b829-488557732639.png?resizew=205)
作法:①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
②作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
③以A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
④作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
即直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
根据上述尺规作图的过程,回答以下问题:
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)该作图中,可以得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f3d1fcc7dfe5820e30c7d8109c36e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
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名校
5 . 如图,在等边三角形
的外侧作直线
,点
关于直线
的对称点为点
,连接
,
,其中
交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/15bd5c09-5dab-4d09-bc18-c6cde35f3271.png?resizew=100)
(1)依题意补全图形(要求:尺规作图并保留作图痕迹,不写作法,标明字母);
(2)若
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/15bd5c09-5dab-4d09-bc18-c6cde35f3271.png?resizew=100)
(1)依题意补全图形(要求:尺规作图并保留作图痕迹,不写作法,标明字母);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ed11c47dae25f6e7176016ce78b44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9009379527d405909c494f7df7877bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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6 . 如图,已知
和线段
,点M,N在射线
,
上.
的角平分线和线段
的垂直平分线,交于点P,保留作图痕迹,不写作图步骤;
(2)连接
、
,过P作
,
,垂足分别为点C和点D,求证:
,请补全下列证明.
证明:∵P在线段
的垂直平分线上,
∴
,( )
P在
的角平分线上,
,
,
∴
,( )
请补全后续证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1e98c3ba2bb2199c1985e4d3728639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb69be70ba0babb236757648695faca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc993c195dbce3b3c1a75d64fe2353b1.png)
证明:∵P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6a05d58fd4527873e6edfb7789afe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1e98c3ba2bb2199c1985e4d3728639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb69be70ba0babb236757648695faca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
请补全后续证明.
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4卷引用:2024年广西河池市下里中学中考数学一模试题
(已下线)2024年广西河池市下里中学中考数学一模试题北京师范大学附属实验中学2023-2024学年八年级上学期期中数学试题河南省南阳市内乡县2023-2024学年八年级上学期期末数学试题2024年河南省商丘市夏邑县第二初级中学教育集团中考一模数学试题
7 . 下面是小明设计“作三角形一边上的高”的尺规作图和证明过程.
已知:
中,
,求作:
的边
上的高
.
作法:(1)分别以点B和点C为圆心.
为半径作弧,两弧相交于点E.
(2)作直线
交
边于点D.
所以线段
就是所求作的高.
证明:连接
,
∵
,
∴点B在线段
的垂直分线上(依据:)
同理可证,点C也在线段,
的垂直平分线上
∴
垂直平分
,
∴
是
的高.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/348da489-7f00-45d5-9cf2-fa2324930ae4.png?resizew=140)
(1)根据小明设计的尺规作图过程,使用直尺和圆规.补全图形 (保留作图痕迹);
(2)小明证明过程中的依据 是:______.
(3)善于思考的小明提出了这样一个问题,若
,
,
的长度又是多少呢?请你帮助小明完成解答过程 .
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/03902478df1a55bc99703210bccab910.png)
作法:(1)分别以点B和点C为圆心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c0de3ac77d2159b623117b0a71d5ec.png)
(2)作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
所以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec07ca71c03f8c1d6d3a1e2efcdff02.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bae74865b97db7ced7fbf67303668ee.png)
∴点B在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
同理可证,点C也在线段,
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/348da489-7f00-45d5-9cf2-fa2324930ae4.png?resizew=140)
(1)根据小明设计的尺规作图过程,使用直尺和圆规.
(2)小明证明过程中的
(3)善于思考的小明提出了这样一个问题,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5c43af8617515259e51e5e364995fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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|
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3卷引用:广西壮族自治区南宁市南宁高新技术产业开发区民大中学2022-2023学年八年级上学期期中数学试题
8 . 根据题意,先补全图形,再作答:
如图所示,在
中,作
边的垂直平分线,交
于点
,交
于点
,连接
.若
,
,证明:
.
(补全图形要求:尺规作图,不写作法,保留作图痕迹)
如图所示,在
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/0374c406b563f0d258aa5c2654bbd06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a427709e6575431882877cda3b59ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
(补全图形要求:尺规作图,不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/0f692a5e-ecb1-420f-9cd7-83830cb1794a.png?resizew=174)
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9 . 数学综合实践课上,李老师在黑板上布置了一道尺规作图题如下:
下面是各个数学小组进行的一系列探究,请你根据探究内容解决问题.
(1)进步小组的作法:以点P为圆心,
长为半径作弧,交⊙
于点B(非点A),作直线
,则直线
即为所求作的切线.问题:
①请你在图(2)中补全进步小组的作图痕迹.
②进步小组通过连接
,
,证明
,他们证明两个三角形全等的依据为______(填“
”“
”或“
”).
(2)希望小组的作法:如图(3),连接
,作
的垂直平分线m交
于点M,以点M为圆心,
长为半径作圆,交
于点B(非点A),作直线
,则直线
即为所求作的切线.
问题:该组的小华根据作图方案给出如下证明过程.
证明:连接
,由作图知,
是
的※,
∴
,(理由:◎)
即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85be38645f49e81c1c754f22ceb10c3.png)
又
是
的半径,
∴
为
的切线.
在上述证明过程中,※处应该填写______;
◎处应该填写______(填序号)
①一条弧所对的圆周角等于它所对的圆心角的一半
②90°的圆周角所对的弦是直径
③直径所对的圆周角是直角
④同弧所对的圆周角相等
(3)拓展小组的作法:如图(4),连接
交
于点C,过点C作
的垂线n,以点O为圆心,
长为半径作弧,交直线n于点D,连接
交
于点B,作直线
,则直线
即为所求作的切线.问题:请你结合该组作图方案给出证明过程.
利用尺规过圆外一点作圆的切线. 已知:如图(1), ![]() ![]() 求作:圆的另一条切线 ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/919d147d-f13e-4d94-a675-dacdb827edee.png?resizew=542)
下面是各个数学小组进行的一系列探究,请你根据探究内容解决问题.
(1)进步小组的作法:以点P为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
①请你在图(2)中补全进步小组的作图痕迹.
②进步小组通过连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395f3eb57b9d06e0e236e751afa11afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
(2)希望小组的作法:如图(3),连接
![](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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
问题:该组的小华根据作图方案给出如下证明过程.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ca68d5863d95d52f4d8d7a9e1c5f83.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85be38645f49e81c1c754f22ceb10c3.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
在上述证明过程中,※处应该填写______;
◎处应该填写______(填序号)
①一条弧所对的圆周角等于它所对的圆心角的一半
②90°的圆周角所对的弦是直径
③直径所对的圆周角是直角
④同弧所对的圆周角相等
(3)拓展小组的作法:如图(4),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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2023-05-30更新
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165次组卷
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3卷引用:广西壮族自治区南宁市西乡塘区第十八中学2023-2024学年九年级上学期期中数学试题
名校
10 . 下面是小雪设计的“作以已知线段为斜边的等腰直角三角形”的尺规作图过程.
已知:线段
.
求作:以
为斜边的一个等腰直角
.
作法:
①分别以点
和点
为圆心,大于
的长为半径作弧,两弧相交于
、
两点;
②作直线
,交
于点
;
③以
为圆心,
的长为半径作圆,交直线
于点
;
④连接
.则
即为所求作的三角形.根据小雪设计的尺规作图过程:
(1)尺和圆规补全图形(保留作图痕迹):
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/0b49b5be-b233-47bf-ad30-eeb122d97270.png?resizew=149)
(2)证明:
为以
为斜边的等腰直角三角形.
已知:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求作:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
作法:
①分别以点
![](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/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
③以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)尺和圆规补全图形(保留作图痕迹):
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/0b49b5be-b233-47bf-ad30-eeb122d97270.png?resizew=149)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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