1 . 如图,在Rt
中,
,动点
从点A开始以
的速度向点
运动,动点
从点
开始以
的速度向 点A运动,两点同时运动,同时停止,运动时间为
s
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/e2bc067a-05a1-432f-aad1-f3ffdc6bfbd9.png?resizew=198)
(1)当
为何值时,
是等边三角形?
(2)当
为何值时,
是直角三角形?
(3)过点
作
于点
,连接
;
①求证:四边形AFDP是平行四边形;
②当
为何值时,
的面积是
面积的一半?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dfc3b9d7f07b52a69ceecbc36a1808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1102c5b4b6ad4dedf1446d80831ce19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171e02f78e30ca17469c7ec007dd8db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f051275aa34c90fd6957973f6640753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/e2bc067a-05a1-432f-aad1-f3ffdc6bfbd9.png?resizew=198)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9374cdec65a41dc616f6f099551880d6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9374cdec65a41dc616f6f099551880d6.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034425077b05a897039fe93a231f0e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
①求证:四边形AFDP是平行四边形;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dfc3b9d7f07b52a69ceecbc36a1808.png)
您最近一年使用:0次
2022-07-16更新
|
242次组卷
|
2卷引用:四川省甘孜藏族自治州2021-2022学年八年级下学期期末数学试题
2 . 如图,
是
的平分线,点E,M分别在射线
上,作射线
,以M为中心,将射线
逆时针旋转
,交
所在直线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/5e861696-abce-4973-9567-88d85decf3b3.png?resizew=526)
(1)按要求画图,并完成证明.
过点M作
,交射线
于点H,求证:
是等边三角形.
(2)当点F落在射线
上,请猜想线段
三者之间的数量关系,并说明理由;
(3)当点F落在射线
的反向延长线上,请直接写出线段
三者之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32422c2c57c87da787771e7d502ece63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/5e861696-abce-4973-9567-88d85decf3b3.png?resizew=526)
(1)按要求画图,并完成证明.
过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1a7897ef6e2b7dc90b7edcd455805d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76247a80ed5c4e1eee6bd8d29e34e2d4.png)
(2)当点F落在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b917a1f5302b0c8a6d5cbd5b62f211a4.png)
(3)当点F落在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b917a1f5302b0c8a6d5cbd5b62f211a4.png)
您最近一年使用:0次
2022-07-07更新
|
112次组卷
|
2卷引用:辽宁省铁岭市2021-2022学年八年级下学期期中数学试题
名校
3 . 如图,正方形ABCD中,
,点E在边CD上,且
.将
沿AE对折至
,延长EF交边BC于点G.连结AG、CF.下列结论:①
;②
;③
是正三角形;④
的面积为90,其中正确的是___________ (填所有正确答案的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f325403cbedaac249c9a78d33da81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7920c260a4793cb02b78dabe2d817d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0e2233a5e812e006e037a1533d5dc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82c3746720aa0d4ae15e61220cad1cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e977cb08909ddb77a8c1236bca620ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178ef566563d3d778805a160cc2ec6a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/ebef4a31-019d-464e-9ccb-0d10d81a928f.png?resizew=119)
您最近一年使用:0次
2022-07-04更新
|
186次组卷
|
5卷引用:江苏省苏州市市区学校2018-2019学年八年级下学期期末数学试题
江苏省苏州市市区学校2018-2019学年八年级下学期期末数学试题2019年江苏省苏州市姑苏区第二学期期末考试八年级数学试卷江苏省苏州市张家港梁丰中学2020-2021学年八年级下学期3月月考数学试卷福建省厦门外国语学校2020-2021学年八年级下学期期末数学试题(已下线)数学(江苏徐州A卷)-学易金卷:2022-2023学年八年级下学期期中考前必刷卷
名校
4 . 某学习小组的学生在学习中遇到了下面的问题:
如图1,在△ABC和△ADE中,∠ACB=∠AED=90°,∠CAB=∠EAD=60°,点E,A,C在同一条直线上,连接BD,点F是BD的中点,连接EF,CF,试判断△CEF的形状并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983559708033024/2983715615121408/STEM/5ccd913211e649748fc11f5e30625732.png?resizew=409)
(1)问题探究:小婷同学提出解题思路:先探究△CEF的两条边是否相等,如EF=CF,以下是她的证明过程
请根据以上证明过程,解答下列两个问题:
①在图1中作出证明中所描述的辅助线;
②在证明的括号中填写理由(请在SAS,ASA,AAS,SSS中选择).
(2)在(1)的探究结论的基础上,请你帮助小婷求出∠CEF的度数,并判断△CEF的形状.
(3)问题拓展:如图2,当△ADE绕点A逆时针旋转某个角度时,连接CE,延长DE交BC的延长线于点P,其他条件不变,判断△CEF的形状并给出证明.
如图1,在△ABC和△ADE中,∠ACB=∠AED=90°,∠CAB=∠EAD=60°,点E,A,C在同一条直线上,连接BD,点F是BD的中点,连接EF,CF,试判断△CEF的形状并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983559708033024/2983715615121408/STEM/5ccd913211e649748fc11f5e30625732.png?resizew=409)
(1)问题探究:小婷同学提出解题思路:先探究△CEF的两条边是否相等,如EF=CF,以下是她的证明过程
证明:延长线段EF交CB的延长线于点G. ∵F是BD的中点, ∴BF=DF. ∵∠ACB=∠AED=90°, ∴ED∥CG. | ∴∠BGF=∠DEF. 又∵∠BFG=∠DFE, ∴△BGF≌△DEF(______ ). ∴EF=FG. ∴CF=EF= ![]() |
①在图1中作出证明中所描述的辅助线;
②在证明的括号中填写理由(请在SAS,ASA,AAS,SSS中选择).
(2)在(1)的探究结论的基础上,请你帮助小婷求出∠CEF的度数,并判断△CEF的形状.
(3)问题拓展:如图2,当△ADE绕点A逆时针旋转某个角度时,连接CE,延长DE交BC的延长线于点P,其他条件不变,判断△CEF的形状并给出证明.
您最近一年使用:0次
5 . 已知:如图1,四边形ABCD是菱形,
,
,∠MAN绕顶点A逆时针旋转,边AM与射线BC相交于点E(点E与点B不重合),边AN与射线CD相交于点F.
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977160430264320/2979236389199872/STEM/8fed6452-7c07-480f-84da-7eb217976b80.png?resizew=528)
(1)当点E在线段BC上时,求证:
;
(2)连EF,判断△AEF的形状并说明理由;
(3)连接BD,在旋转过程中,如果以A、B、F、D为顶点的四边形是平行四边形,求线段BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf94f2272ada85e69ee132c19f15d4d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977160430264320/2979236389199872/STEM/8fed6452-7c07-480f-84da-7eb217976b80.png?resizew=528)
(1)当点E在线段BC上时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)连EF,判断△AEF的形状并说明理由;
(3)连接BD,在旋转过程中,如果以A、B、F、D为顶点的四边形是平行四边形,求线段BE的长.
您最近一年使用:0次
名校
6 . 如图,点C是以
为直径的半圆O上的动点,
,连接
,点D是
上一动点,连接
,且
与
相交于点F.过点C作
与
的延长线交于点E使得
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966633281994752/2969518790443008/STEM/bde73e53-5f2a-4a60-aee6-21b4715ae7a6.png?resizew=244)
(1)求证:
是
的切线;
(2)当四边形
是平行四边形时,判断
形状,并说明理由;
(3)当点F为
中点且
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a602e72d5f0f6e4a87292a34fe95c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3e97e006197d3e5944db619288e8559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5898ecbb5c528fa6cd5844d2133eb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2818248596e92a8c087ee9366773e05.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966633281994752/2969518790443008/STEM/bde73e53-5f2a-4a60-aee6-21b4715ae7a6.png?resizew=244)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81629b9b9d595affde8c24361402c420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)当点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac7036aa06c1d8c224f4a90647d4d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
2022-04-30更新
|
524次组卷
|
2卷引用:2022年广东省中山市九年级第二次模拟考试数学试卷
名校
7 . 如图
,已知抛物线
,与
轴交于点
,点
与
轴交于点
,抛物线的顶点为
,其对称轴与
轴交于
点.
![](https://img.xkw.com/dksih/QBM/2022/4/24/2965127488847872/2967415466999808/STEM/149d9a2a89fc4e5f83df15689ac5cffe.png?resizew=597)
(1)抛物线解析式为______,顶点
的坐标为______;
(2)判断
的形状,并说明理曲;
(3)如图
,点
是线段
上的一个动点(点
与点
、点
不重合),连结
、
,过点
作
,射线
交射线
于点
,交抛物线于点
;过点
作
,垂足为点
,
交射线
于点
.
①当
≌
时,请求出此时点
的坐标;
②当
时,请你直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6ac8b99f58e8b4f20d7cffd4332549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81aac485ef3bfc95f34655fddcc14fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8ba5b5ad8c9fc664b9d28ab9422d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/24/2965127488847872/2967415466999808/STEM/149d9a2a89fc4e5f83df15689ac5cffe.png?resizew=597)
(1)抛物线解析式为______,顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ef1f78ab9660a970999b762854888a.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03526fddc48f9f7298afc3da414c2e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19db78d89ab2a7a67e853282a70114a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60158453fd24b1af2f4f65a3d2e46d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fac090cfd6987c7d1122afe5c44f25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84524cdd1b595c18c1cc3b0ef5d59cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142908219d9e799ee454fc7d523312bf.png)
您最近一年使用:0次
8 . 综合与实践
问题情境:
在综合与实践课上,老师组织同学们以“矩形的折叠”为主题开展数学活动.
操作发现:
某数学小组对图1的矩形纸片ABCD进行如下折叠操作∶
第一步∶如图2,把矩形纸片ABCD对折,使AD与 BC重合,得到折痕MN,然后把纸片展开;
第二步∶如图3,将图 2中的矩形纸片沿过点B的直线折叠,使得点A落在MN上的点
处,折痕与 AD交于点E,然后展开纸片,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2948597569544192/2950909007323136/STEM/193c0906-f9e6-428e-a0d1-6ff0f1a9e1ee.png?resizew=361)
问题解决:
(1)请在图 2中利用尺规作图,作出折痕 BE;(保留作图痕迹)
(2)请你判断图3中△ ABA'的形状,并说明理由;
(3)如图4,折痕BE与MN交于点F,BA'的延长线交直线CD于点P,若MF=1,BC=7,请你直接写出PD的长.
问题情境:
在综合与实践课上,老师组织同学们以“矩形的折叠”为主题开展数学活动.
操作发现:
某数学小组对图1的矩形纸片ABCD进行如下折叠操作∶
第一步∶如图2,把矩形纸片ABCD对折,使AD与 BC重合,得到折痕MN,然后把纸片展开;
第二步∶如图3,将图 2中的矩形纸片沿过点B的直线折叠,使得点A落在MN上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e426a62526413cfde473429b2aee396.png)
![](https://img.xkw.com/dksih/QBM/2022/4/1/2948597569544192/2950909007323136/STEM/193c0906-f9e6-428e-a0d1-6ff0f1a9e1ee.png?resizew=361)
问题解决:
(1)请在图 2中利用尺规作图,作出折痕 BE;(保留作图痕迹)
(2)请你判断图3中△ ABA'的形状,并说明理由;
(3)如图4,折痕BE与MN交于点F,BA'的延长线交直线CD于点P,若MF=1,BC=7,请你直接写出PD的长.
您最近一年使用:0次
2022-04-04更新
|
246次组卷
|
3卷引用:2022年山西省晋中市九年级下学期第一次模拟数学试题
名校
9 . 已知AB∥CD,且CB⊥AB于点B,AN⊥DC于点N,M是线段NC上的一点,点P是CB延长线上的动点,连接AM,AP,
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897180870877184/2930407439499264/STEM/36ffc294-247a-45ce-bd05-c25cc23ad227.png?resizew=538)
(1)如图1,若CB=PB,且C、P两点不重合,∠APB=60°,请用直尺在图中连接一条线段,使图中存在一个等边三角形,并说明理由.
(2)如图2,若∠NAP=2∠AMN,
①请猜想此时∠APC与∠NAM的数量关系,并进行证明.
②若点M为NC的中点,且AN=BC,请探究BC、BP、AP之间的数量关系,并进行证明.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897180870877184/2930407439499264/STEM/36ffc294-247a-45ce-bd05-c25cc23ad227.png?resizew=538)
(1)如图1,若CB=PB,且C、P两点不重合,∠APB=60°,请用直尺在图中连接一条线段,使图中存在一个等边三角形,并说明理由.
(2)如图2,若∠NAP=2∠AMN,
①请猜想此时∠APC与∠NAM的数量关系,并进行证明.
②若点M为NC的中点,且AN=BC,请探究BC、BP、AP之间的数量关系,并进行证明.
您最近一年使用:0次
名校
10 . 如图,两个全等的等边三角形△ABC与△ACD,边长为6,高为a,在拼成的四边形ABCD中,点E、F分别为AB、AD边上的动点,满足BE=AF,连接EF,CE,CF.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844951318560768/2900551081402368/STEM/ebd46d4e-b615-4ff7-bbbc-a5881af44894.png?resizew=194)
(1)求证:△CEF是等边三角形;
(2)△AEF周长的最小值是 .(用含a的式子表示)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844951318560768/2900551081402368/STEM/ebd46d4e-b615-4ff7-bbbc-a5881af44894.png?resizew=194)
(1)求证:△CEF是等边三角形;
(2)△AEF周长的最小值是 .(用含a的式子表示)
您最近一年使用:0次
2022-01-23更新
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286次组卷
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2卷引用:广东省珠海市文园中学2021-2022学年八年级上学期期中数学试题