名校
1 . 如图,在四边形
中,
,
,
上截取
,作
交
于点F;
(保留作图痕迹,不写作法)
(2)在(1)所作图形中,求证:
(请补全下面的证明过程,不写证明理由)
证明:∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴ ①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df89e372474c87ac158a7b8f22e27b8.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0095edf048d91dc2910056a866febb5a.png)
∴ ②
∴ ③
∴四边形
为平行四边形
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ee224ad0d3ac27adcc7c4d7684fe78.png)
∴ ④
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3620030e8808da46df97330103827913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0095edf048d91dc2910056a866febb5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(保留作图痕迹,不写作法)
(2)在(1)所作图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbc0e76b7abb656327bdc97226713e1.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴ ①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df89e372474c87ac158a7b8f22e27b8.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0095edf048d91dc2910056a866febb5a.png)
∴ ②
∴ ③
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ee224ad0d3ac27adcc7c4d7684fe78.png)
∴ ④
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbc0e76b7abb656327bdc97226713e1.png)
您最近一年使用:0次
2024-03-19更新
|
219次组卷
|
2卷引用:重庆市江北区鲁能巴蜀中学校2023-2024学年九年级下学期第一次月考数学试题
2024九年级下·云南·专题练习
2 . 有这样一个作图题目:画一个平行四边形
,使
,
,
.
下面是小红同学设计的尺规作图过程.
作法:如图,
作线段
,
以
为圆心,
为半径作弧,以
为圆心,
为半径作弧,两弧交于点
;
再以
为圆心,
为半径作弧,以
为圆心,
为半径作弧,两弧交于点
;
连接
,
,
.
所以四边形
即为所求作平行四边形.
根据小红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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c94316312f093ebfc80b872a83c25.png)
(2)完成下列证明.
证明:
以
为圆心,
为半径作弧,以
为圆心,
为半径作弧,两弧交于点
,
______
,
______
.
以
为圆心,
为半径作弧,以
为圆心,
为半径作弧,两弧交于点
,
∴
,
,
又
,
,
______.
四边形
是平行四边形
______
填推理依据
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35ed92397da56c7afbd6967597a9611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eee6f84b2af5e06da1cd3d0a1f3a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f9fc63aeaac7f7e359f1bcd734a90f.png)
下面是小红同学设计的尺规作图过程.
作法:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35ed92397da56c7afbd6967597a9611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8b8edd94bc4d5d517ec77e56800e41.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/9d78abbad68bbbf12af10cd40ef4c353.png)
所以四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
根据小红设计的尺规作图过程.
(1)使用直尺和圆规,补全图形;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce08128582a7e855852c03e0ac5d0487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c94316312f093ebfc80b872a83c25.png)
(2)完成下列证明.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f5c2d3e232c5b1b9d976a55e4d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27ae4abe9a90ac25d09482ab9b965a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0296e95debd4bb13666830f537525648.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86ed1b50cafc1ab2cd4e3496ab057ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb32f2d5c9fb0227f67dce1a912a399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce08128582a7e855852c03e0ac5d0487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb216d77a18d90f6b8b70fecc1c5379c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8c94316312f093ebfc80b872a83c25.png)
您最近一年使用:0次
3 . 下面是小橙设计的“已知两相交直线作矩形”的尺规作图过程:
(1)使用直尺和圆规,按照作法补全图(保留作图痕迹)
(2)完成下面的证明:
证明:
∵
,
,
∴四边形
是 .( )
∵
,
∴
,即
,
∴四边形
是矩形.( )(填推理的依据)
已知;如图,直线![]() ![]() ![]() 求作:矩形 ![]() 作法: ①在直线 ![]() ②以点O为圆心, ![]() ![]() ![]() ③连接 ![]() ![]() ![]() ![]() 即四边形 ![]() |
(1)使用直尺和圆规,按照作法补全图(保留作图痕迹)
(2)完成下面的证明:
证明:
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdad2e298d52079589e6de6d69d042e9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebe0cbafbb260627dc64d379a912247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
4 . 下面是小明同学设计的“已知一组邻边构造平行四边形”的尺规作图过程.
已知:如图,线段
.求作:平行四边形
.
作法:①分别以A、C为圆心,
的长为半径画弧,两弧交于点D;
②连接
.四边形
即为所求作的平行四边形.
(1)请你使用直尺和圆规,帮助小明补全尺规作图过程(保留作图痕迹);
(2)证明上述作法所得的四边形
是平行四边形.
已知:如图,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
作法:①分别以A、C为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdba2ac1a72eea482f5578843e00357.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e545f31f7cc57a31843f5adfd02941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/dca98d12-8042-4cc6-8019-fd305d1f8e3f.png?resizew=151)
(1)请你使用直尺和圆规,帮助小明补全尺规作图过程(保留作图痕迹);
(2)证明上述作法所得的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2023-08-12更新
|
29次组卷
|
2卷引用:广东省珠海市梅华中学2023-2024学年九年级上学期开学考试数学试题
名校
5 . 如图,在四边形
中,
,
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/0bb2a1de-f760-4279-90a4-d56a62517ef2.png?resizew=184)
(1)尺规作图:作
的平分线交
于点F(不写作法,保留作图痕迹);
(2)在(1)中所作的图中,证明:四边形
为平行四边形的结论(请补全下面的证明过程,将答案写在答题卡对应的番号后,不写证明理由).
解:(2)证明:
∵
,
,
∴____________,
∴
,
∴
______,
∵
平分
,
∴
,
∴
,
∴
,
同理可得
,
∵
,
∴______=______,
∵
,
∴
,
即
,
又∵
,
∴____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/0bb2a1de-f760-4279-90a4-d56a62517ef2.png?resizew=184)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)在(1)中所作的图中,证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
解:(2)证明:
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴____________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7cecd2d5b7eac66bfd39a1d0b555b3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b8e8956faa2abfb725ce10006082bb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95165e75fd7ce2d553ae30298a453b22.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
同理可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/becb00e0bd65d2fe3cc6b4869c093aae.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
∴______=______,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa6ba9c1fa086a2c23a1a46354ef8c9.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3139e28714bfc3d5d875d78dd245d2e.png)
∴____________.
您最近一年使用:0次
2023-03-19更新
|
243次组卷
|
2卷引用:重庆市铜梁区巴川中学校2022-2023学年九年级下学期3月月考数学试题
名校
6 . 如图,在平行四边形
中,
,点E是线段
上的一点,连接
.
上求作一点F,使得
(要求:尺规作图,不写作法,保留作图痕迹);
(2)在(1)所作的图中,证明:四边形
为平行四边形的结论(请补全下面的证明过程,将答案写在答题卡对应的番号后,不写证明理由).
解:(2)证明:在平行四边形
中,
∵
,
∴_________________,
∴四边形
是矩形,
∴
,
,
,
在
和
,
,
∴
,
∴_____________,
,
∴
,
∴_____________,
∴四边形
为平行四边形(两边分别相等的四边形为平行四边形).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2fc51de957401a6193689497e6014d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115abfd93e351177fcb914b01746a0c1.png)
(2)在(1)所作的图中,证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
解:(2)证明:在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a2fc51de957401a6193689497e6014d.png)
∴_________________,
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1df5eef344966877c4f7e49a018a1180.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b3bfd79517903007e3854b3976bcbc.png)
∴_____________,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe5e99b05b12867d0eb144bc7dd90f8.png)
∴_____________,
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
您最近一年使用:0次
2023-03-13更新
|
334次组卷
|
3卷引用:重庆市第八中学校2022-2023学年九年级下学期月考数学试题
重庆市第八中学校2022-2023学年九年级下学期月考数学试题重庆市垫江县垫江第八中学校2023-2024年九年级上学期第二次月考数学试题(已下线)中考重点01 尺规作图+补全证明过程(5题型+满分技巧+限时检测)-2024年中考数学【热点·重点·难点】专练(重庆专用)
名校
7 . 如图,在
中,点
为
边上的中点,连接
.
(1)尺规作图:在
下方作射线
,使得
,且射线
交
的延长线于点
(不要求写作法,保留作图痕迹);
(2)在(1)所作的图中,连接
,若
,求证:四边形
是菱形.(请补全下面的证明过程)
证明:∵点
为
边上的中点,
∴
,在
和
中,
∴
______
,
∴
______,
∵
,
∴
______.
∴四边形
是平行四边形.
又∵______,
∴平行四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/03902478df1a55bc99703210bccab910.png)
(1)尺规作图:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59089701b1cfb9ac3db3b5a7f8cac66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)在(1)所作的图中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09de6bc03bcf984c84aebc72352da50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
证明:∵点
![](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/93b5d552bf92224ac9332e93741fcfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8bb612d0f7026aec94934aef6be87e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99a4fb4dbd721ef657d1213029c1142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa17bfc0cd0fdd664844863e6ad6dbb7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3083d9aebe96fe494ae51f4777b5673.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429551ecb5930b2f033019e4d5b37ad7.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
又∵______,
∴平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
您最近一年使用:0次
2022-11-21更新
|
561次组卷
|
8卷引用:重庆市第一中学校2022-2023学年九年级上学期期中数学试题
重庆市第一中学校2022-2023学年九年级上学期期中数学试题重庆市沙坪坝区第一中学校2022-2023学年九年级上学期11月月考数学试题重庆市重庆实验外国语学校2022-2023学年九年级上学期第一次定时月考数学试题重庆市潼南区2022-2023学年九年级下学期第一次联合测试数学试题2023年重庆市合川区合阳中学中考一模数学试题(已下线)专题12 三角形-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(重庆专用)(已下线)专题25 尺规作图+补全证明过程(35道)-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(重庆专用)重庆市开州区开州初中教育集团2023-2024学年八年级下学期4月期中数学试题
名校
8 . 阅读下面材料:
在数学课上,老师提出如下问题:
已知:如图1,在Rt△ABC中,∠ABC=90°.
求作:矩形ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/40a29238-1113-4325-81e5-693463338d1d.png?resizew=337)
小明的做法如下:
①以点A为圆心,BC长为半径作弧,以点C为圆心,AB长为半径作弧;
②两弧在AB上方交于点D,连接DA、DC.四边形ABCD即为所求矩形.
请你根据小明同学设计的尺规作图过程:
(1)使用直尺和圆规,依作法在图1中补全图形(保留作图痕迹);
(2)完成下面的证明:
证明:
∵AD=BC,CD=AB,
∴四边形ABCD是平行四边形( )填推理依据,
∵∠ABC=90°,
∴四边形ABCD是矩形( )填推理依据.
在数学课上,老师提出如下问题:
已知:如图1,在Rt△ABC中,∠ABC=90°.
求作:矩形ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/40a29238-1113-4325-81e5-693463338d1d.png?resizew=337)
小明的做法如下:
①以点A为圆心,BC长为半径作弧,以点C为圆心,AB长为半径作弧;
②两弧在AB上方交于点D,连接DA、DC.四边形ABCD即为所求矩形.
请你根据小明同学设计的尺规作图过程:
(1)使用直尺和圆规,依作法在图1中补全图形(保留作图痕迹);
(2)完成下面的证明:
证明:
∵AD=BC,CD=AB,
∴四边形ABCD是平行四边形( )填推理依据,
∵∠ABC=90°,
∴四边形ABCD是矩形( )填推理依据.
您最近一年使用:0次
名校
9 . 如图,
中,
是
边上的中线,
于点
,
作
于点
,连接
(保留作图痕迹,不写作法)
(2)在(1)所作图形中,求证:四边形
是平行四边形.(请补全下面的证明过程,不写证明理由)
证:
,
___________
.
∵
是
边上的中线,
∴___________.
∵在
和
中,
___________,
∴
.
∴___________.
∵
,
∴四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac18b0388014ae20b2add2975ef56aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64f7e27edb91bfa28737ecaab7d4fdd.png)
(2)在(1)所作图形中,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe00e8d4c9fc1c79beca7456677a8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d4b2ea14fc92c158f58512320af490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴___________.
∵在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdda64e2dd89a47e4f4e137c229607c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b963014ab63579a920a2d0f11bceef.png)
___________,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b06102b020414452ef5e532974259f.png)
∴___________.
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次
2022-10-31更新
|
372次组卷
|
4卷引用:重庆市第一中学校2022-2023学年九年级上学期阶段性消化作业(一) 数学试题
重庆市第一中学校2022-2023学年九年级上学期阶段性消化作业(一) 数学试题重庆市松树桥中学校2023-2024学年九年级上学期期中数学试题重庆市沙坪坝区南开中学校2023-2024学年九年级上学期12月月考数学试题(已下线)中考重点01 尺规作图+补全证明过程(5题型+满分技巧+限时检测)-2024年中考数学【热点·重点·难点】专练(重庆专用)
名校
10 . 阅读下面材料:
在数学课上,老师提出如下问题:
小明的思考过程是:
小明的作法如下:
请你根据小明同学设计的尺规作图过程:
(1)使用直尺和圆规,依作法在图1中补全图形(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,
∴
,
∵
,
∴四边形
是平行四边形( ① )(填推理的依据).
∵
,
∴四边形
是矩形( ② )(填推理的依据).
(3)参考小明的作图思路,另外设计一种作法,利用直尺和圆规在图2中完成.
(温馨提示:保留作图痕迹,不用写作法和证明)
在数学课上,老师提出如下问题:
已知:如图,在![]() ![]() 求作:矩形 ![]() ![]() |
(1)由于求作矩形,回顾了矩形的定义和判定: 矩形的定义:有一个角是直角的平行四边形叫做矩形; 矩形判定1:对角线相等的平行四边形是矩形; 矩形判定2:有三个角是直角的四边形是矩形. (2)条件给出了 ![]() (3)小明决定通过作线段AC的垂直平分线,作出线段 ![]() ![]() |
作法:(1)分别以点A,C为圆心,大于![]() (2)作直线 ![]() ![]() ![]() (3)作射线 ![]() ![]() ![]() ![]() (4)连接 ![]() ![]() ∴ 四边形 ![]() ![]() |
(1)使用直尺和圆规,依作法在图1中补全图形(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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)参考小明的作图思路,另外设计一种作法,利用直尺和圆规在图2中完成.
(温馨提示:保留作图痕迹,不用写作法和证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/3a64ab36-5bab-4434-ac37-09303ad2e026.png?resizew=151)
您最近一年使用:0次
2022-07-29更新
|
220次组卷
|
3卷引用:北京市通州区潞河中学2022-2023学年九年级上学期开学开始数学试题