已知:如图,
是线段
的垂直平分线,E,F是
上的两点.
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf02a5fedd9db674168f36551eeb3fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/4e2e8a12-4e1e-4b3a-9407-53a77376e76a.png?resizew=187)
20-21八年级下·全国·课后作业 查看更多[3]
(已下线)【北师大版课时练习】 八年级下册 第一章 三角形的证明 2 直角三角形四川省达州市渠县第二中学2022-2023学年八年级下学期第三次月考数学试题陕西省西安市铁一中学(曲江校区)2023-2024学年八年级下学期第一次月考数学试题
更新时间:2021-11-01 16:39:29
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相似题推荐
解答题-作图题
|
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名校
【推荐1】下面是“作已知角的平分线”的尺规作图过程:
(1)补全尺规作图.
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846870513639424/2900210844049408/STEM/fa73f2e5752a4867af1fe7cbbe011d84.png?resizew=207)
(2)完成证明过程:
证明:在△OEP和△OFP中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b470bc3896c709f722cd4a8ca932a0.png)
∴△OEP≌△OFP( ③ )
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be64bcc09a8e60a0c00241c31182485.png)
∴OP平分∠AOB
已知,∠AOB. 求作:射线OP,使OP平分∠AOB. 作法: 1.以点O为圆心,任意长为半径画弧,分别交射线OA、OB与点E、F; 2.分别以点E、F为圆心,以大于 ![]() 3.画射线OP.射线OP即为所求 |
![](https://img.xkw.com/dksih/QBM/2021/11/8/2846870513639424/2900210844049408/STEM/fa73f2e5752a4867af1fe7cbbe011d84.png?resizew=207)
(2)完成证明过程:
证明:在△OEP和△OFP中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b470bc3896c709f722cd4a8ca932a0.png)
∴△OEP≌△OFP( ③ )
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be64bcc09a8e60a0c00241c31182485.png)
∴OP平分∠AOB
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解答题-作图题
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真题
【推荐1】(1)如图,已知
为边
上一点,请用尺规作图的方法在边
上求作一点
.使
.(保留作图痕迹,不写作法)
,则
的周长是_______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3ad6a51b85451f6a10e6799fb0a6a5.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fad4a370cf245c60505557c744f0b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7c5fcc189ac7d3b6a1be85c9048c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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解答题-作图题
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【推荐2】学习了轴对称后,小璧和小山来到乡村振兴基地进行了实践性研究. 如图,要把一块三角形的土地均匀分给甲、乙、丙三家农户. 如果
,
,要使这三家农户所得土地的大小、形状都相同. 小山认为可以先作
的平分线交
于点
,然后再过点
作
边的垂线即可,小壁思考片刻后认为小山的方法复杂了,她还有更简洁的方法就可以做到——只需要作边
的垂直平分线一条辅助线即可办到. 请聪明的你根据小璧的思路完成以下作图与填空:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/5a7f0d4a-d040-4a5d-85ea-c88086712207.png?resizew=308)
(1)用直尺和圆规作
的垂直平分线
交
于点
,垂足为点
.(只保留作图痕迹)
(2)已知:如图,
中,
,
,边
的垂直平分线
交
于点
,垂足为点
,连接
.
求证:
,
证明:
,
_________,
由作图可知
,
,
,
垂直平分
,
_________,
_________,
,
_________,
.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0769bbeb13bd66ee39f530417be0f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/5a7f0d4a-d040-4a5d-85ea-c88086712207.png?resizew=308)
(1)用直尺和圆规作
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0769bbeb13bd66ee39f530417be0f92.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ad56f6ea5a0b9c5563b847aca19e10.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44887be9e110c9d6e3f8b589af0ddbfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e918e78749b99a0d392c0a6c0af1ad5a.png)
由作图可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6d802f1872b89278793f31d4b020ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83210883723ae145fa9403938dc0d8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc529cf55d35c9fa85c7741d9bdd2f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1949518fc246fbd8426d08f701ade25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e65f7589c63c09b848884975b55c073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b59af2939a7ae844290b8274bb8f041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f42c924c1e90f4d73a747b493fc508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9082842bfd67dfd64911a1b135710807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818d503d627bb8496a261cd90c1f81d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3154668c0203d998d226011d7221d4a.png)
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