1 . 下面是小明同学设计的“过直线外一点作已知直线的平行线”的尺规作图过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9318b008-4c9d-40ca-b17d-1288d0054fa2.png?resizew=438)
已知:如图1,直线l和直线l外一点P.
求作:直线
,使直线
.
作法:如图2,
①在直线l上取一点A,连接
;
②作
的垂直平分线
,分别交直线l,线段
于点B,O;
③以O为圆心,
长为半径作弧,交直线
于另一点Q;
④作直线
,所以直线
为所求作的直线.
根据上述作图过程,回答问题:
(1)用直尺和圆规,补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线
是
的垂直平分线,
∴
___________,
.
∵
___________,
∴
.
∴___________=___________.
∴
(___________)(填推理的依据)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9318b008-4c9d-40ca-b17d-1288d0054fa2.png?resizew=438)
已知:如图1,直线l和直线l外一点P.
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d10d01d01eb7d3e619e59a48e04982.png)
作法:如图2,
①在直线l上取一点A,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
②作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
③以O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
④作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
根据上述作图过程,回答问题:
(1)用直尺和圆规,补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5516a7ad03e49c26d9a6303365664fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a050019a4e44edbe9450286c5cda38f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabd48b7e4fccb07e82cb215bb76eab0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156466281d1713c6f4f561dd372465f0.png)
∴___________=___________.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
您最近一年使用:0次
名校
2 . 下面是小青设计的“过直线外一点作这条直线的平行线”的尺规作图过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/1abeab3d-af65-422b-af65-0bf40fad4949.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/2e7019cb-b521-400a-9555-7af951a0d815.png?resizew=166)
已知:直线l及直线l外一点P.
求作:直线
,使得
.
作法:如图,
①在直线l上任取两点A,B,连接
,
;
②分别作线段
,
的垂直平分线
,
,两直线交于点O;
③以点O为圆心,
长为半径作圆;
④以点A为圆心,
长为半径作弧,与
在l上方交于点Q;
⑤作直线
,所以直线
就是所求作的直线.
根据小青设计的尺规作图过程,
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
,
∵点A,B,P,Q都在
上,
,
∴
___________,
∴
,(___________)(填推理的依据)
∴
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/1abeab3d-af65-422b-af65-0bf40fad4949.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/2e7019cb-b521-400a-9555-7af951a0d815.png?resizew=166)
已知:直线l及直线l外一点P.
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
作法:如图,
①在直线l上任取两点A,B,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②分别作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
③以点O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
④以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
⑤作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
根据小青设计的尺规作图过程,
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
∵点A,B,P,Q都在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89dabfd8275fc029696e08a4bf105c93.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ee1999eed244b91e793f7eaee0bb13.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05059ab7dbb22bef96d07855083c0b26.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
您最近一年使用:0次
2022-12-28更新
|
119次组卷
|
2卷引用:北京市燕山地区2022-2023学年九年级上学期期末质量监测数学试卷
3 . 下面是小青设计的“过直线外一点作这条直线的平行线”的尺规作图过程.
已知:直线l及直线l外一点P.
求作:直线
,使得
.
作法:如图,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/380ab6b1-e6a9-44d5-9e61-dd8334bd6ff2.png?resizew=394)
①在直线l上取点A,连接
;
②作线段
的垂直平分线
,分别交直线l,直线
于点B,O;
③以点O为圆心,
长为半径画弧,交直线
于另一点Q;
④作直线
.所以直线
就是所求作的直线.
根据小青设计的尺规作图过程,
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
,
∵线段
的垂直平分线交
于点O,
∴
,(_____________________)(填推理的依据)
又∵
,
______,
∴
,(_____________________)(填推理的依据)
∴
,
∴
.
已知:直线l及直线l外一点P.
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
作法:如图,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/380ab6b1-e6a9-44d5-9e61-dd8334bd6ff2.png?resizew=394)
①在直线l上取点A,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
②作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
③以点O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
④作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
根据小青设计的尺规作图过程,
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
∵线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b9f123cfacbfe6e5504111fbfd174c.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f98ff3666810eb183b66a86f747e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee17bf358df97490bc56b1e5a15a678.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba43ac19e5698d6368a28cb92e1da845.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43460283aa3418a0ed8296ad9ac7eb1.png)
您最近一年使用:0次
2022-12-28更新
|
184次组卷
|
3卷引用:北京市燕山区2022-2023学年八年级上学期期末质量监测数学试卷
北京市燕山区2022-2023学年八年级上学期期末质量监测数学试卷北京市燕山地区2022-2023学年八年级上学期期末质量监测数学试卷(已下线)专题1.3 线段的垂直平分线-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(北师大版)
名校
4 . 下面是小菲设计的“作一个角等于已知角的二倍”的尺规作图过程.
已知:
中,
.
求作:
,使得
.
作法:如图,
![](https://img.xkw.com/dksih/QBM/2022/12/16/3132047804096512/3134282271547392/STEM/955278a2cc854ce3a040fcec10b05cde.png?resizew=155)
①分别以点A和点C为圆心,大于
的长为半径作弧,两弧交于M、N点,作直线
;
②分别以点A和点B为圆心,大于
的长为半径作弧,两弧交于P、Q点,作直线
,
和
交于点D;
③连接
和
;以点D为圆心,
的长为半径作
.所以
.
根据小菲设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
∵
和
分别为
、
的垂直平分线,
∴
___________
.(___________)(填推理的依据)
∴点D是
的外接圆的圆心.
∵点C是
上的一点,
∴
.(___________)(填推理的依据).
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
作法:如图,
![](https://img.xkw.com/dksih/QBM/2022/12/16/3132047804096512/3134282271547392/STEM/955278a2cc854ce3a040fcec10b05cde.png?resizew=155)
①分别以点A和点C为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②分别以点A和点B为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
③连接
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c72c070f4f4d2b44927391b59a1e755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
根据小菲设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79d122b68c9166884bdfbfaf77680187.png)
∴点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∵点C是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c72c070f4f4d2b44927391b59a1e755.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
您最近一年使用:0次
名校
5 . 下面是小菲设计的“作一个角等于已知角的二倍”的尺规作图过程.
已知:
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
求作:
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
作法:①作
的垂直平分线
;
②作
的垂直平分线
,交
于点
;
③连接
和
;
④以点
为圆心,
的长为半径作
;
所以
即为所求作的角
![](https://img.xkw.com/dksih/QBM/2022/10/26/3096137321037824/3097220664926208/STEM/4fdc1f9613424c6bb0b247467af5a06a.png?resizew=175)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接
,
∵
和
分别为
、
的垂直平分线
∴
_________(___________________________)(填推理的依据)
∴
是
的外接圆.
∵点
是
上的一点,
∴
(___________________________)(填推理的依据)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e95be88bc79b3c7e72d349c4cb3c88d.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
作法:①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
④以点
![](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/5c72c070f4f4d2b44927391b59a1e755.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://img.xkw.com/dksih/QBM/2022/10/26/3096137321037824/3097220664926208/STEM/4fdc1f9613424c6bb0b247467af5a06a.png?resizew=175)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fafe77990fc33415f3bf2c63433ffb3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c72c070f4f4d2b44927391b59a1e755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c72c070f4f4d2b44927391b59a1e755.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
您最近一年使用:0次
名校
6 . 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)
您最近一年使用:0次
2022-11-22更新
|
0次组卷
|
3卷引用: 北京市汇文中学教育集团2022-2023学年八年级上学期期中数学试卷
名校
7 . 如图,AC为矩形ABCD的对角线,
.
(2)在(1)所作的图形中,连结AF,CE,求证:四边形AFCE是菱形.(请补全下面的证明过程)
证明:∵四边形ABCD是矩形,
∴
,
∴
,
.
∵EF平分AC,
∴________.
∴
________.
∴
________.
又∵
,
∴四边形AFCE是________.
又∵
,
∴四边形AFCE是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
(2)在(1)所作的图形中,连结AF,CE,求证:四边形AFCE是菱形.(请补全下面的证明过程)
证明:∵四边形ABCD是矩形,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d527b7de54224cc1698843a59a19a5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db20e6de4b0be30b54b7f1e85cd643bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63aa6ed284b26eb08ecc576b9ae9a97.png)
∵EF平分AC,
∴________.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d243548099dfd714796a6ba2ea71add.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d527b7de54224cc1698843a59a19a5.png)
∴四边形AFCE是________.
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
∴四边形AFCE是菱形.
您最近一年使用:0次
2022-07-09更新
|
574次组卷
|
4卷引用:2022年重庆市沙坪坝区初中学业水平暨高中招生适应性考试数学试题
名校
8 . 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:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/0121c0db-f636-4ab4-8fec-53fa57882bb2.png?resizew=264)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:
直线
是线段
的垂直平分线,点
在直线
上,
.(_______________)(填推理的依据)
_______________
_______________.
,
,
_______________.
.
.(_______________)(填推理的依据)
和
都是等腰三角形.
(3)乐乐进一步探究:以点
为圆心,适当长为半径画弧分别交
,
于
,
两点,再分别以点
,
为圆心,大于
的长为半径画弧,两弧在
内交于点
,直线
交
于点
,则
(_______________)(填写理由).使用尺规作图在图中补全作图痕迹.
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
下面是乐乐设计的尺规作图过程.
作法:如图,①作直角边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
根据乐乐设计的尺规作图过程,解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/0121c0db-f636-4ab4-8fec-53fa57882bb2.png?resizew=264)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615b83b22cad1dc5c17003222902b9f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54bb3caba2b157026325b3d8a5404fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f617fa80f09fc245909492f5335ea5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5ec6ae60e65b8e9e4535d7ed8824be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56467f968960eeefe3c07848d9f9cf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95fa17deaad3b053e6b07b689027c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6a0ecd3278b28fd79decab925864d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da03c676a174b5086b19d0bffc0213d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d2e7ddcf283d2b091268ed65eb1bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93f77fc658b1f307566bb05d6d629fb.png)
(3)乐乐进一步探究:以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e34652865d75f195cfe551b3fcf41bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.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/553a93e0b6156befa00b50bdfaef95d9.png)
您最近一年使用:0次
2022-08-18更新
|
326次组卷
|
3卷引用:河南省郑州市金水区2021-2022学年七年级下学期期末数学试题
9 . 如图,在
中,
,作
的垂直平分线交
于点
,交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892050606702592/2944642704637952/STEM/5d7b9556-7274-4909-9c89-2943cc70f654.png?resizew=163)
(1)按要求补全图形(尺规作图,保留作图痕迹,不写作法);
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892050606702592/2944642704637952/STEM/5d7b9556-7274-4909-9c89-2943cc70f654.png?resizew=163)
(1)按要求补全图形(尺规作图,保留作图痕迹,不写作法);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2022-03-26更新
|
321次组卷
|
3卷引用:云南省昆明市官渡区2021-2022学年八年级上学期期末数学试题
10 . 如图,在
中,
,
的垂直平分线
交边
于点
,交边
于点
,连接线段
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/991224e4-f551-40af-b931-187642ee0b72.png?resizew=136)
(1)按照题意用尺规作图的方法补全图形(不写作法,保留作图痕迹);
(2)若
,求
的度数;
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/991224e4-f551-40af-b931-187642ee0b72.png?resizew=136)
(1)按照题意用尺规作图的方法补全图形(不写作法,保留作图痕迹);
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
您最近一年使用:0次
2022-04-17更新
|
138次组卷
|
4卷引用:安徽省六安市霍邱县2021-2022学年八年级上学期期末数学试题