1 . 已知
,利用直尺和圆规画一个
,使得
,可以先画出
,接下来的画法不能满足条件的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/3e23b80b-2ceb-4c40-9bd1-ab3676016b68.png?resizew=256)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e67da1bf51e5f87750a63dc9e856ee87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28c0a8cce8b8aa6920ef60c9a7e1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370b9e7adca3fe9a5f5cf2c7abe3a46d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/3e23b80b-2ceb-4c40-9bd1-ab3676016b68.png?resizew=256)
A.在射线![]() ![]() ![]() ![]() ![]() |
B.在射线![]() ![]() ![]() ![]() ![]() |
C.在射线![]() ![]() ![]() ![]() |
D.在射线![]() ![]() ![]() ![]() |
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2 . 如图1是两个大小不同的三角板叠放在一起,图2是由它得到的抽象几何图形,已知
,
,
,且点
,
,
在同一条直线上,
,
,连接
.现有一只壁虎以
的速度从
处往
处爬,壁虎爬到
点所用的时间为________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658fd17adf2e7cda29d2e2f00b055a9d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e445fd64446d3fd0afd9ab3fca8af79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65502a7ea4d1ce6d6d8c720845c73e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/dc865858-5fe2-47c2-ab13-8c354421b243.png?resizew=246)
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6卷引用:河南省安阳市汤阴县2022-2023学年八年级上学期期中数学试题
河南省安阳市汤阴县2022-2023学年八年级上学期期中数学试题(已下线)专题13.13 等腰三角形(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题2.13 等腰三角形的轴对称性(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)第十二章全等三角形单元复习课河南省漯河市临颍县2023-2024学年八年级上学期期中数学试题天津市外国语大学附属学校2023-2024学年八年级上学期期末数学试题
3 . 【提出问题】在一次数学探究活动中,李老师给出了一道题.如图①,点
是等边
内的一点,连接
、
、
.当
,
,
时,求
的度数.
【解决问题】小明在解决此题时,将点
绕点
逆时针方向旋转
得到点
,连接
、
、
,并结合已知条件证得
.
请利用小明的作法及结论求
的度数.
【方法应用】如图②,点
是正方形
内一点,连接
、
、
.若
,
,
,则
______________°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
【解决问题】小明在解决此题时,将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70bfd26dc978c7373f7b976d813f7e6e.png)
请利用小明的作法及结论求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
【方法应用】如图②,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3643fbbf4e0775dea240dff8fd6dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6b50b8b9011f2d7d1f3de2526796e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437edc71c77dbb17d84dbbb84ac1785b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a84b7de4bcbaa36f542b7ac3886bba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/ddaa4667-5a25-455e-bf1a-8f9ccb8d3e8b.png?resizew=354)
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4 . 如图,在平面直角坐标系中,
的边
,
分别在
轴,
轴上,以原点
为圆心、
的长为半径作圆,交
轴于点
,以原点
为圆心、
的长为半径作圆,交
轴于点
,连接
,不做其他计算,就可判定
,其判定依据是( )
![](https://img.xkw.com/dksih/QBM/2022/12/27/3140099079127040/3141116436185088/STEM/1035b3ed48084c149af4503f06db460b.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833003cfb9b4fa0b99be6f48e9cd0e75.png)
![](https://img.xkw.com/dksih/QBM/2022/12/27/3140099079127040/3141116436185088/STEM/1035b3ed48084c149af4503f06db460b.png?resizew=181)
A.![]() | B.![]() | C.![]() | D.![]() |
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解答题-证明题
|
较易(0.85)
|
名校
5 . 课上,老师提出了这样一个问题:
已知:如图,
,请你再添加一个条件 ,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f04c6fa60799fba2f89cd7bfeef1f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/e678d164-77ae-4830-a7cb-2268745579ee.png?resizew=123)
(1)同学们认为可以添加的条件并不唯一,你添加的条件是______,并完成证明
(2)若添加的条件是
,证明:
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f04c6fa60799fba2f89cd7bfeef1f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/e678d164-77ae-4830-a7cb-2268745579ee.png?resizew=123)
(1)同学们认为可以添加的条件并不唯一,你添加的条件是______,并完成证明
(2)若添加的条件是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f04c6fa60799fba2f89cd7bfeef1f4.png)
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2022-12-19更新
|
282次组卷
|
4卷引用:北京市第十三中学分校2022-2023年八年级上学期期中数学试卷
北京市第十三中学分校2022-2023年八年级上学期期中数学试卷(已下线)专题12.19 添加条件证明三角形全等(分层练习)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题1.19 添加条件证明三角形全等(分层练习)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)北京市朝阳区陈经纶中学2023-2024学年八年级上学期月考数学试题
名校
6 . 在课堂上,老师发给每人一张印有
(如图所示)的卡片,然后,要同学们尝试画一个
,使得
.小赵和小刘同学先画出了
之后,后续画图的主要过程分别如图所示
老师评价:他俩的做法都正确.请你选择一位同学的做法,并说出其作图依据.我选______ 的做法(填“小赵”或“小刘”),他作图判定
的依据是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217a0a060f7f3e07774cd513a7f04659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e65541fa2c916e1c7aa16f4edf1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e8e22765029ced3348067d7265f158.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/164280ea-948f-45bd-9719-3cffe9c5cd1f.png?resizew=663)
老师评价:他俩的做法都正确.请你选择一位同学的做法,并说出其作图依据.我选
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e65541fa2c916e1c7aa16f4edf1ba.png)
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2022-12-19更新
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3卷引用:北京市第十三中学分校2022-2023年八年级上学期期中数学试卷
北京市第十三中学分校2022-2023年八年级上学期期中数学试卷(已下线)专题1.2 直角三角形-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(北师大版)北京市回民学校2023-2024学年八年级上学期期中数学试题
7 . 如图,小明在游乐场玩两层型滑梯,每层楼梯的高度相同
,都为
米,他想知道左右两个滑梯
和
的长度是否相等,于是制定了如下方案:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/5f62638f-820d-40dd-ba7b-0fc5a7fb524b.png?resizew=228)
(1)根据小明的测量方案和数据,判断两个滑梯
和
的长度是否相等?并说明理由.
(2)试猜想左右两个滑梯
和
所在直线的位置关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936822dd96061ceac83070543cdebcf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212d6e1f4d7dcc0e5e902c46e3b1dfcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
课题 | 探究两个滑梯的长度是否相等 |
测量工具 | 长度为6米的来尺 |
测量步骤 | ①测量出线段![]() ②测量出线段 ![]() |
测量数据 | ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/5f62638f-820d-40dd-ba7b-0fc5a7fb524b.png?resizew=228)
(1)根据小明的测量方案和数据,判断两个滑梯
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)试猜想左右两个滑梯
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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70次组卷
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2卷引用:山西省大同市云州区2022-2023学年八年级上学期期中评估数学试题
8 . 完成下面小题
(1)小亮想用长度均为奇数的三根小棒搭一个三角形,其中两根木棒的长度分别为
和
,第三根木棒的长度应该是多少?
(2)分别画出如图所示
的三条边上的高.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/3c8cef5e-8e38-4b7c-8399-1a266b45424f.png?resizew=163)
(3)如图,点E在
上,
,
,请你写出图中两对全等三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/13493790-e6a8-45d0-ad6c-78af2dcd9c4d.png?resizew=182)
(4)下图是一个图案的一半,其中的虚线是这个图案的对称轴,画出这个图案的另一半图.
(1)小亮想用长度均为奇数的三根小棒搭一个三角形,其中两根木棒的长度分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce710269ec0786472cad1bb73ee7d3ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
(2)分别画出如图所示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/3c8cef5e-8e38-4b7c-8399-1a266b45424f.png?resizew=163)
(3)如图,点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369c72048f75562d93c7436cd8001fa6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/13493790-e6a8-45d0-ad6c-78af2dcd9c4d.png?resizew=182)
(4)下图是一个图案的一半,其中的虚线是这个图案的对称轴,画出这个图案的另一半图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/7dbfad0f-30cd-498a-96f6-5a20eeb96fd8.png?resizew=53)
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9 . 如图,已知
,且
,点P在线段
上从点A向点B运动,点Q从点B在射线
上向点D的方向运动,运动的速度是
,当点P运动到B时同时停止.若P、Q两点同时出发,设运动时间为t(s),请问在这个运动过程中,是否存在
与
全等?如果存在,求出t的值,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96188a9885e02eac9f687bf1bcbc2f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b13964019381c4cd9de05f95c4261b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/2572126a-6188-47a1-97f0-90b0f839df0b.png?resizew=188)
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22-23八年级上·全国·课后作业
10 . 已知
(如图),用三种不同的方法作
,使
.你认为哪一种作法比较简便?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3199797df195c03880377e578cdb98f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f9eee4cb3e2be70c42786a36027fdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/3a4e7ce4-cc3d-4739-979a-53a63e3a974a.png?resizew=153)
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