1 . 如图所示,在
中,
,F是
延长线上一点,点E在
上,且
.
求证:
(1)
;
(2)判断
的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe8cf980aa6fadbc4855f7f97c112a0.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/9d96a5d40d0aea9f4398ca4d0fe9b0dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/f4fa34b3-255c-408a-a166-52a9ab12d2f8.png?resizew=174)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205b22ca60c16790c82010acf1558aae.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a62645bd831f1cb6b385f95ea1b7f4e.png)
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2 . 已知:如图,点B,E,F,C在同一条直线上,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/7045e3eb-997b-4b13-8008-daf92f8f487e.png?resizew=174)
(1)求证:
.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/7045e3eb-997b-4b13-8008-daf92f8f487e.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e153e07a91c773708d981b1d18bbacf8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f83486d310a4423f2fcdf4c0114cc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
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名校
3 . 已知:如图所示
和
都是等腰直角三角形,
,连接
.那么
和
有什么关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e88ee337b7c9082f4fe84fd1752d55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/509b9bc6-220e-468e-b463-a06fe4295b89.png?resizew=148)
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4 . 如图,已知在
中,
,
,D为
的中点,设点P在线段
上以
的速度由B点向C点运动,点Q在线段
上由C点向A点运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/8ad4f8b5-12f9-4bf2-bc14-38854a8fde71.png?resizew=129)
(1)若Q点运动的速度与P点相同,且点P,Q同时出发,经过1秒钟后
与
是否全等?并说明理由;
(2)若点P,Q同时出发,但运动的速度不相同,当Q点的运动速度为多少时,能在运动过程中有
与
全等?
(3)若点Q以(2)中的速度从点C出发,点P以原来的速度从点B同时出发,都是沿
的三边逆时针运动,经过多长时间点P与点Q第一次在
的哪条边上相遇?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0eb3a997e903ffdd60f43dc30a720e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.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/f4e5acdedbab4bba6a4f5defc72c70b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/8ad4f8b5-12f9-4bf2-bc14-38854a8fde71.png?resizew=129)
(1)若Q点运动的速度与P点相同,且点P,Q同时出发,经过1秒钟后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(2)若点P,Q同时出发,但运动的速度不相同,当Q点的运动速度为多少时,能在运动过程中有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(3)若点Q以(2)中的速度从点C出发,点P以原来的速度从点B同时出发,都是沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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5 . 如图,是一个测量工件内槽宽的工具,点
既是
的中点,也是
的中点,若测得
,则该内槽
的宽为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b17780af83951db886c2d993cdc68ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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2024-03-09更新
|
143次组卷
|
2卷引用:云南省保山市腾冲市第八中学2023-2024学年八年级上学期第三次月考数学试题
6 . 公元前6世纪,古希腊哲学家泰勒斯这样测得轮船到海岸的距离:如图所示,在海边灯塔上进行测量,直立一根可以原地转动的竖竿
(垂直于地面),在其上一点A处连接一个可以绕A转动并固定在任意位置上的横杆,先转动横杆使其转向船的位置B,再转动竖竿
,使横杆对准岸上的一点C,然后测量D,C的距离,即得D,B的距离,哲学家得到
的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39be7fa371a7a86257d0dc42f38cdedc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/a90ef354-19bc-4e25-b781-e85d097c23f1.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 如图,点C、E、B、F在一条直线上,
,
.
.
(2)若
,求:
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaae99b4ac308549134169e69247a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc64bdd6cc9450d32091f957381d25e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533f1f6ead0d794bb7c70cce9173d4a5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000f23c6259711336bdbf68fa3af234d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2024-03-08更新
|
277次组卷
|
4卷引用:江苏省镇江市丹阳市第三中学2023-2024学年八年级上学期第一次作业调研数学试题
江苏省镇江市丹阳市第三中学2023-2024学年八年级上学期第一次作业调研数学试题(已下线)专题4.9 探索三角形全等的条件(SSS和SAS)(分层练习)(基础练)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)广东省深圳市光明区2023-2024学年七年级下学期期中数学试题(已下线)第4章 三角形(单元测试·综合卷)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)
8 . 如图,
,
表示两根长度相同的木条,若
是
,
的中点,经测量
,则容器的内径
为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/a3e35c47-64db-4fd5-b4e5-bc4b799ba8ac.png?resizew=121)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dcd1e5a4383edc90e632416ae17e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/a3e35c47-64db-4fd5-b4e5-bc4b799ba8ac.png?resizew=121)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 如图,已知
,要用“
”判定
,则需要补充的一个条件为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/03463cd6-b851-4dc0-8a5c-34ed94d21684.png?resizew=155)
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10 . 如图,已知
,则
的根据是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/77e1db7b-0760-4198-ac6c-0d8c2687cf72.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170efb9dd74d3bbd2c8d86782c1a4f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a14c9489a8475cfcaf629fc7e6f59e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/77e1db7b-0760-4198-ac6c-0d8c2687cf72.png?resizew=146)
A.![]() | B. ![]() | C.![]() | D.![]() |
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