1 . 在
中,
,将
绕点B顺时针旋转
,得到
,连接
、
,射线
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/c9d63ddc-0a3d-4b86-b76b-24dfa8bcf54a.png?resizew=353)
(1)如图1,当
时:①
的度数是 ;②求证:点F为
的中点;
(2)当
时,(1)中②的结论还成立吗?若成立,请仅就图)中的情形进行证明;若不成立,请说明理由.
![](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/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fb076c97adfcbc0379f371ea1f429a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d2a15061b3f15f299a1c9c1ba66084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/c9d63ddc-0a3d-4b86-b76b-24dfa8bcf54a.png?resizew=353)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449d9e1077ec791367d36557259fbece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f684691d325611ebafa7954b009bc128.png)
您最近一年使用:0次
2023-05-10更新
|
263次组卷
|
5卷引用:安徽省合肥一六八新桥学校2022--2023学年九年级下学期开学考试数学试题
2 . (1)证明角平分线具有的性质:角平分线上的点到角的两边的距离相等.为了更直观、清楚地表达题意,我们通常在证明之前画出图形,并用符号表示已知和求证.如图1,已知:
平分
,点
在
上,
,
,垂足分别为
,
.求证:
.
(2)如图2,在
中,
平分
,交
于点
,
于点
,
于点
,
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70aa83794b41e477e7b546ecbe435ed.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/374e2198b495b86b0f8308d28035a3db.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70aa83794b41e477e7b546ecbe435ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b890ec052726349f230803ae1c052d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0328dbe259bbc4af4c897d16ee6e504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/ef9e803c-d84c-4403-8362-62d2f530ad9b.png?resizew=344)
您最近一年使用:0次
2023-01-03更新
|
130次组卷
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4卷引用:安徽省滁州市定远县育才学校2022-2023学年八年级下学期开学考试数学试题
名校
3 . 如图所示,
、
均是等边三角形,点A、
、
在同一条直线上,
交
于点
,
交
于点
,连接
.
(1)试证明
;
(2)试证明
;
(3)
是什么三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/92f9522c-3c82-41fc-806e-57b536b0c851.png?resizew=175)
(1)试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
(2)试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cbd27d06065f2ddd5cf5ccbe5bef48.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
您最近一年使用:0次
2023-10-12更新
|
203次组卷
|
3卷引用:安徽省霍邱县第一中学城南分校2021-2022学年八年级下学期开学考试数学试题
4 . 如图,在
中,
,
,D为边
上一点,
于E,连接
并延长交
于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/e2bbfaa1-fb13-4007-8613-d537c08e96ed.png?resizew=206)
(1)若
,
,求
的长;
(2)若
,求证:
.
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/e2bbfaa1-fb13-4007-8613-d537c08e96ed.png?resizew=206)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02816311aebc9c6c4e110d595ce1b037.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114a2e56d9a32e3886fd517a85ede50d.png)
您最近一年使用:0次
2024-01-30更新
|
136次组卷
|
3卷引用:安徽省池州市贵池区2023-2024学年九年级下学期开学考试数学试题
5 . 如图①,过山车是一种机动游乐设施,常见于游乐园中,深受年轻游客的喜爱.如图②,过山车的轨道近似看成
,轨道的支撑架AB,CD均与地面BC垂直,且与
相切,点E为CD上一点,连接AE交
于点F,连接DF并延长BC交于点G.已知
.
(1)求证:
;
(2)若
,
的半径为3,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/58138c6e-a7d7-40bf-bfa3-8502d5023a14.jpg?resizew=251)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4052bb6154835a36bd4de19505675e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490dba7da9a3f60c2f9440b2ddd0162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
6 . 如图,点
在等边三角形
的边
上,点
在
的延长线上,
,交
于点
,
.
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8daff96303a07819bd4ee47731e73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458f98e7078cb3259c18542be9749feb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/bff5e9f9-81b1-49ec-9b69-d418144bdef2.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
2023-09-11更新
|
130次组卷
|
2卷引用:安徽省池州市2022-2023学年八年级下学期开学考试数学试题
名校
7 . 如图,在四边形
中,
,点E是
的中点,
平分
.求证:
是
的平分线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/68656c3f-b6c5-41b8-9017-173b6b73c2c6.png?resizew=129)
您最近一年使用:0次
2023-08-17更新
|
267次组卷
|
5卷引用:安徽省合肥市中国科技大学附属中学2022-2023学年八年级下学期开学考试数学试卷
安徽省合肥市中国科技大学附属中学2022-2023学年八年级下学期开学考试数学试卷山东省日照市日照第二中学2021-2022学年八年级上学期期末数学试题(已下线)第04讲 角平分线的判定与性质(知识解读+真题演练+课后巩固)-2023-2024学年八年级数学上册《知识解读·题型专练》(苏科版)(已下线)第06讲 角平分线的判定与性质(知识解读+真题演练+课后巩固)-2023-2024学年八年级数学上册《知识解读·题型专练》(浙教版)(已下线)第05讲 三角形全等的判定(12类题型)-【帮课堂】2023-2024学年八年级数学上册同步学与练(浙教版)
名校
8 . 如图,
,
,
,点N在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a66c7352-f0bd-4a82-bf2b-9b6a43419156.png?resizew=151)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0924ce860bafcd7f78b87d6a42f48f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ab1ed974720833129aede2ef31643c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/a66c7352-f0bd-4a82-bf2b-9b6a43419156.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1735543d7a5dcbedff4f7a54276bf7d5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc3ef6a72ecee9efdca1f447fa243d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274e29821dd4630a7182573b7c654f1f.png)
您最近一年使用:0次
2023-01-09更新
|
240次组卷
|
2卷引用:安徽省合肥市中国科技大学附属中学2022-2023学年八年级下学期开学考试数学试卷
真题
名校
9 . 在正方形ABCD中,点M是边AB的中点,点E在线段AM上(不与点A重合),点F在边BC上,且
,连接EF,以EF为边在正方形ABCD内作正方形EFGH.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/98b71632-068c-4b4a-a9f4-aaa3375c734a.png?resizew=333)
(1)如图1,若
,当点E与点M重合时,求正方形EFGH的面积,
(2)如图2,已知直线HG分别与边AD,BC交于点I,J,射线EH与射线AD交于点K.
①求证:
;
②设
,
和四边形AEHI的面积分别为
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d0d6dc13cf6b6d1a0e0c1d55ad0ba2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/21/98b71632-068c-4b4a-a9f4-aaa3375c734a.png?resizew=333)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
(2)如图2,已知直线HG分别与边AD,BC交于点I,J,射线EH与射线AD交于点K.
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c10d68fc1a69fc35ccaa617741755b9.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578823914efc61d64ddea7565de3b57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fadf74fe8cb7683292d768c08981d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c307cf62cfdae4e08168c8f0d7158ecb.png)
您最近一年使用:0次
2022-06-20更新
|
3304次组卷
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16卷引用:安徽省 桐城市第二中学2023-2024学年九年级下学期开学考数学试题
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10 . 如图,在
中,AC是对角线,
,垂足分别为点E,F,连接BE,DF.
![](https://img.xkw.com/dksih/QBM/2022/6/27/3010441445990400/3049947257864192/STEM/1f94a1079ab14aa89c5ab78619a7a301.png?resizew=202)
(1)求证:四边形DEBF是平行四边形.
(2)若
,求CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aaa063d2e7c4585a021929c6fa8505a.png)
![](https://img.xkw.com/dksih/QBM/2022/6/27/3010441445990400/3049947257864192/STEM/1f94a1079ab14aa89c5ab78619a7a301.png?resizew=202)
(1)求证:四边形DEBF是平行四边形.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1906aed9d0b48753d2763e08d763db6a.png)
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