1 . 如图,在
中,点E为
边上一点,
,连结
,
交
于点F,连结
,
,若
,
,则
的长为_________ .
![](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/0105d0889f6fa9cb5430cf9e09337173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859c3bdde4cf8567ae5a57cdf5352f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8832c5450a61500ccbf73d95e16f449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/aa807bb6-7595-47a1-8e32-a12edc02e6ce.png?resizew=208)
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11-12八年级上·河北石家庄·期中
名校
2 . 在锐角
中,
,
垂直平分线与
所在的直线相交所得的锐角为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
________ .
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb94bd9eb80fb9f5f02f518bb8f2211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
您最近一年使用:0次
2024-01-25更新
|
160次组卷
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56卷引用:【全国区级联考】重庆市江津区2017-2018学年八年级(上)期末数学试卷
【全国区级联考】重庆市江津区2017-2018学年八年级(上)期末数学试卷(已下线)2011—2012学年河北省石家庄外国语学校初二年级第一学期数学期中试卷2014-2015学年江苏省南苑中学八年级上学期第一次单元考试数学试卷2014-2015学年湖北省黄冈黄梅县实验中学八年级上学期期中数学试卷2016-2017学年江苏靖江靖城中学八年级上期独立作业数学试卷黑龙江省大庆市肇源县2017届九年级上学期第一次月考(10月)数学试题江苏省宿迁市现代实验学校2016-2017学年八年级上学期第一次月考数学试题江苏省江阴市要塞片2017-2018学年八年级上学期期中考试数学试题天津市红桥区 铃铛阁中学 2017-2018学年 八年级数学上册 轴对称图形 填空题练习甘肃省武威市民勤五中2017-2018学年八年级(上)期中数学试卷2017-2018 北师大版数学八年级下册 第一章 三角形的证明 1.3 线段的垂直平分线 同步训练题人教版九年级数学中考训练《三角形》综合检测卷【校级联考】河南省商水县2017-2018学年八年级上学期期末考试数学试题(已下线)第一章综合测评卷-2018年八年级下册数学名师学案(北师大版)2018-2019学年八年级数学下册北师大版习题:第一章检测卷【校级联考】黑龙江省伊春市嘉荫县2018-2019学年八年级上学期期末考试数学试题2019年内蒙古呼和浩特市初中升学考试预测卷数学试题卷2019年浙江省丽水市实验学校数学中考模拟试卷辽宁省辽阳市第九中学2018-2019学年八年级(下)第一次学情测试数学试题2019年四川省达州市开江县七年级下学期期末考试数学试题四川省达州市开江县2018-2019学年七年级下学期期末数学试题山东省莱州市2018-2019学年七年级第二学期期末学业水平检测数学试题江苏省泰州市部分学校2019-2020学年八年级第一学期学情抽查数学试题湖南省益阳市第六中学初中部2019-2020学年八年级上学期期中考试数学试题山东省烟台市莱州市2018-2019学年七年级下学期期末数学试题四川省成都市盐道街中学2018-2019学年八年级下学期期中数学试题内蒙古霍林郭勒市第五中学2020-2021学年八年级上学期期中数学试题黑龙江省克山县第二中学校2020-2021学年八年级上学期期中数学试题人教版八年级上第十三章 轴对称 综合练习(2)2022年宁夏银川市唐徕回民中学中考第二次模拟数学试题山东省威海市环翠区2021-2022学年七年级下学期期末数学试题黑龙江省佳木斯市抚远市2021-2022学年八年级上学期期中数学试题四川省成都市简阳市2021-2022学年八年级下学期期中数学试题四川省成都市简阳市2021-2022学年八年级下学期期中数学试题甘肃省平凉市庄浪县阳川中学2021-2022学年八年级上学期期中数学试题(已下线)第2章 三角形(B卷·能力提升练)-【单元测试】2022-2023学年八年级数学上册分层训练AB卷(湘教版)北京市海淀区一零一中学石油分校2022-2023学年八年级上学期期中考卷数学试卷湖北省襄阳市谷城县石花镇2022-2023学年八年级上学期期中数学试卷湖南省岳阳市临湘市2022-2023学年八年级上学期期中质量检测数学试题宁夏回族自治区银川市第三中学2020-2021学年八年级下学期期中数学试题黑龙江省齐齐哈尔市龙沙区2022-2023学年八年级上学期期末考试数学试题(已下线)期中押题预测卷(2)(考试范围:第1-4章)-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(北师大版)山东省泰安市泰山区泰山外国语学校(五四制)2022-2023学年七年级下学期5月月考数学试题山东省青岛市市南区青岛第三十九中学2022-2023学年八年级下学期期中数学试题13.3.1 等腰三角形上海市上宝中学2022-2023学年八年级上学期期中模拟数学试题北京市海淀区首都师范大学附属中学2023-2024学年八年级上学期月考数学试题黑龙江省鸡西市2023-2024年八年级上学期第一次月考数学试题江苏省扬州市邗江区邗江区实验学校2023-2024学年八年级上学期10月月考数学试题甘肃省兰州市七里河区第五十五中学2023-2024学年八年级上学期期中数学试题上海市上海外国语大学附属中学2023-2024学年八年级上学期期末数学试题上海外国语大学附属外国语学校2023-2024学年八年级上学期期末数学试题江西省赣州市定南县2023-2024学年八年级上学期期末数学试题山东省聊城市东昌府区聊城东昌中学2023-2024年上学期八年级第二次巩固练习数学试题北京市第一零一中学石油分校2022年八年级上学期期中数学试题2024年黑龙江省哈尔滨市南岗区虹桥初级中学校中考二模数学试题
3 . 如图,在
中,
,
长为6,面积是27,腰
的垂直平分线
分别交
边于点E、F,若点D为
边的中点,点M为线段
上一动点,则
周长的最小值为________ .
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cae7cc6665dc8edfb9060075b3afb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/e5682d63-205e-4514-aa04-b0900bd2e940.png?resizew=177)
您最近一年使用:0次
4 . 如图,在
中,
的垂直平分线分别交
,
于点
,
,连接
,若
,
,则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c157441734cc2f1853bb3e15b631a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1285fa0af282b8645ffd2cf42e505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-01-24更新
|
118次组卷
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4卷引用:重庆市南川区2023-2024学年八年级上学期期末考试数学试题
重庆市南川区2023-2024学年八年级上学期期末考试数学试题重庆市涪陵区2023-2024学年八年级上学期期末数学试题重庆市铜梁区2023-2024学年八年级上学期期末数学试题(已下线)第1章 三角形的证明(单元测试·拔尖卷)-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)
5 . 在学习完勾股定理后,喜欢思考的小明想进一步探究直角三角形斜边的中线,他的思路是:
在
中,先作出直角边
的垂直平分线,并猜测它与斜边
的交点是中点,于是他把交点与点
连接,通过垂直平分线的性质以及等角对等边的代换,他发现了直角三角形斜边的中线与斜边的数量关系.
请根据小明的思路完成以下作图 与填空 :
用直尺和圆规作
的垂直平分线交
与点
,垂足为点
,连接
.(保留作图痕迹,不写作法)
已知:在
中,
,
垂直平分
,垂足为点
.
求证:
.
证明:
垂直平分
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e24c2bdad41127f07c6639a357d2b8.png)
① ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accb9dc1ba79e4195dd5699ee2855c57.png)
在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
,
②
,
③ ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0574184df8079a4d1a45152cbb743da0.png)
.
.
通过探究,小明发现直角三角形均有此特征,请依照题意完成下面命题:
直角三角形斜边的中线 ④
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.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/c5db41a1f31d6baee7c69990811edb9f.png)
请根据小明的思路完成以下
用直尺和圆规作
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a50288ab167742c35976493d21531db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e24c2bdad41127f07c6639a357d2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/accb9dc1ba79e4195dd5699ee2855c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f806322f1529fd8342d5778ebbebd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ed48f47be746e2584e555478d5dfd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df629488364255d931d38ee81ce104db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0574184df8079a4d1a45152cbb743da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffc824972f7280f5fbfad7cd05e749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e16718e16f2ada58db490f442b44401.png)
通过探究,小明发现直角三角形均有此特征,请依照题意完成下面命题:
直角三角形斜边的中线 ④
您最近一年使用:0次
6 . 如图,在
中,
,若
、
分别垂直平分
和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.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/e569f82eb96d237501ed0fba536e9ac4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/bdc6798b-7f82-4f0f-ac93-e1172c40f198.png?resizew=173)
您最近一年使用:0次
7 . 如图,在四边形
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/2eaffe39-c327-4b67-9127-26f589cafc1b.png?resizew=161)
(1)在图中,用尺规作线段
的垂直平分线
,分别交
,
于点E,F;(保留作图痕迹,不写作法)
(2)在(1)条件下,连接
,且
,求证:
是等边三角形.请补充图形,并完成下列证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
垂直平分
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
①______,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
和
中,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(③______),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
④______,
⑤______,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/2eaffe39-c327-4b67-9127-26f589cafc1b.png?resizew=161)
(1)在图中,用尺规作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)在(1)条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076a5273440d800b96bfcaaa9970cc45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7654b4dbc0f9ba23055f4cb65560a223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81ee3a1a773ca1d7c1b81e452d69000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637ed31a01c0abee712b410e81390dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722f767238340c5aa50234dd8fb4de09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
您最近一年使用:0次
8 . 如图,在
中,
是
的垂直平分线,交
于点
,交
于点
,连接
,已知
,
的周长为8
,则
的周长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/c7ef7f64-91fb-4a4a-8784-9eda0a19f08c.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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://staticzujuan.xkw.com/quesimg/Upload/formula/81142c95c19f533aaf179b92ea2c89e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/c7ef7f64-91fb-4a4a-8784-9eda0a19f08c.png?resizew=192)
A.8![]() | B.10![]() | C.12![]() | D.14![]() |
您最近一年使用:0次
9 . 学习了等腰三角形后,小明发现等腰三角形顶角顶点处的外角正好是其底角的两倍,于是他对作一个角等于已知角的两倍有了新的思路,请根据他的思路完成以下作图与推理证明填空,注明其中蕴含的数学依据:
用直尺和圆规,作线段
的垂直平分线
分别交
于点M,交
于点N,连接
.(只保留作图痕迹)
求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/bf29c89a-5fab-4fa7-a082-646dca5b74f2.png?resizew=155)
证明:∵
是
的垂直平分线
∴
① ,(依据: ② );
∴
③ ,(依据:等边对等角).
∵
是
的外角
∴
(依据: ④ );
∴
.
用直尺和圆规,作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.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/438f34bc8b04e8c494b91306ac6fe352.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ef3bdc97849bb74ccbb6e8e7df3d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/bf29c89a-5fab-4fa7-a082-646dca5b74f2.png?resizew=155)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7dc2816d332f8761bfe2db1d9db87e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2979f64c85f82d8975d73ee1c342de.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6500fbe1ea4a372d703502699b809e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0da03ec477a5e17b7f4de370638024.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b8dee1c3dde99a6f6334cc728f5bed.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ef3bdc97849bb74ccbb6e8e7df3d2.png)
您最近一年使用:0次
10 . 如图,点A、B分别在
的边上,
的平分线
与
的垂直平分线
交于点C,
于点E,
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/468f4453-d3b4-4dad-94cb-ba05a7ae078b.png?resizew=178)
(1)求证:
;
(2)若
,
,求
的长;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2c4bfbeba4abcf41c7365c89eb7a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec7fd2d6ecba03af5315e9704660c14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/468f4453-d3b4-4dad-94cb-ba05a7ae078b.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03f416cb4d50a5f473df4bbceeb3094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713af79078f922ea4c71be653c373a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a43149bfa4ff7c541306e0525e4004c.png)
您最近一年使用:0次