1 . 如图,点E,F在
上,
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7437ac06d7480f6c63165c26a24df6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/3daa57cb-d44f-4e91-895a-e40a97fd4f79.png?resizew=124)
您最近一年使用:0次
2023-10-27更新
|
152次组卷
|
2卷引用:福建省福州市2022-2023学年八年级上学期期中模拟数学试题
2 . 我们通过“三角形全等的判定”的学习,可以知道“两边和它们的夹角分别相等的两个三角形全等”是一个基本事实,用它可以判定两个三角形全等;而满足条件“两边和其中一边所对的角分别相等”的两个三角形却不一定全等.下面请你来探究“两边和其中一边所对的角分别相等的两个三角形不一定全等”.
探究:已知
,求作一个
,使
,
,
(即两边和其中一边所对的角分别相等).
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
;②在线段
的上方画
;③画
.
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
明显不全等;
(3)小结
经历以上探究过程,可得结论:______.
探究:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/c6911526-fd14-4993-a75b-0dee532faf5a.png?resizew=147)
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)小结
经历以上探究过程,可得结论:______.
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名校
3 . 如图,C是
的中点,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/918ae9df-956e-4552-bb04-1e264af6025a.png?resizew=168)
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4 . 在测量一个小口圆形容器的壁厚时,小明用“X型转动钳”按如图方法进行测量,其中
,
,测得
,则圆形容器的壁厚是_______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c35c43d90814396ff06336fa45e9650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6a61ac043926cdc6ad916c97610adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2023/10/9/3342403696951296/3345076733779968/STEM/e48adea9e6ea4a408b3f69d0e0691fe0.png?resizew=83)
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5 . 如图,已知点A、E、F、D在同一条直线上,
,垂足分别为F、E,
与
有什么数量关系和位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afc19e2bed2347087c502b5b86b0ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bfe0f655436422e6c73c4a9e8cd79a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/34dcacdf-d12f-453a-9736-f3f516bf10a2.jpg?resizew=171)
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6 . 如图,在四边形中,
,
,
,E,F分别是
的中点.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d5f49c0d6162ea6264c23fdff924cf.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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2023-10-19更新
|
49次组卷
|
2卷引用:广东省佛山市顺德区养正学校等校2023-2024学年九年级上学期月考数学试题
名校
7 . 如图,
,下列条件①
;②
;③
;④
中,若只添加一个条件就可以证明
,则所有正确条件的序号是________ .
A.①② B.①③ C.①②③ D.②③④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591cb1d6d2fa2f4d438364a5fc52bbd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960d61e0d9a749cba705359a15e683d2.png)
A.①② B.①③ C.①②③ D.②③④
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/74fad70b-5352-460c-b57d-b3b19c67584c.png?resizew=115)
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8 . 已知:如图,
,
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/00b65226-9a1b-43a3-a038-6749fbe656cd.png?resizew=185)
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9 . 如图,已知
中,
,
,
,点
为
的中点.如果点
在线段
上以
的速度由点
向点
运动,同时,点
在线段
上由点
向点
运动.
(1)若点
的运动速度与点
的运动速度相等,经过1秒后,
与
是否全等,请说明理由;
(2)若点
的运动速度与点
的运动速度不相等,当点
的运动速度为多少时,能够使
与
全等?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dade4d39e4cc800d302926449267334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c545764505bb00578a870c5e39493a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7580f6a85333c8149459364f852b6306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/7a416178-52de-4944-b3b1-861a71c9f049.png?resizew=101)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
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10 . 已知:如图,
与
相交于点O,且
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c35c43d90814396ff06336fa45e9650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ada52a0dae5711ac607f5384b2532a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/ae0e92bc-88fb-48d8-8187-d3d83bd1932e.png?resizew=181)
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