如图,在四边形
中,
,
,
,
.
;
(2)若
,
,求
的度数.
![](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/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f820ef108b2d7e98cf4b9c2e276a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0335a0ec4699c35b382c0b3fcf7eea32.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4f318fd596282e1d965ab29bbf362f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc849980579cd8b0560d76ba78331ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
23-24八年级上·四川眉山·期中 查看更多[2]
四川省眉山市东坡区万胜初级中学2023-2024学年八年级上学期期中数学试题(已下线)第四章第03讲 探究三角形全等的条件(6类热点题型讲练)-【帮课堂】2023-2024学年七年级数学下册同步学与练(北师大版)
更新时间:2024-02-22 11:46:07
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解答题-证明题
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【推荐2】如图,
,一块三角板的顶点A在直线
上,
、
分别交
与点D、E.已知
,
,
.
,求:
①
的度数;
②当
和
的角平分线交于点I时,
的度数.
(2)如图2,点I在
的角平分线上,连接
,让
,且
请求此时
的度数;
(3)如图3,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e5c74d6accf6fb7f41c4c79c52f7d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c8034aef9ecb15c709331282b96eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda6854efbcf6882940d2036049a16df.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c293b7b03765b1a9cd9af8ed95affb.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b754f7740caedd537e0f3a036e8cda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a36ba2baea5fc3c513cd1e96b5f9ab.png)
(2)如图2,点I在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55eeaa53334d5d11e171dcd4986678f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580690598396a67d581e75f538f1ba1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c293b7b03765b1a9cd9af8ed95affb.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f453e63b9207d2c53dceb3b070e504c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a342105860f2915b84dfa09191970e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a36ba2baea5fc3c513cd1e96b5f9ab.png)
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【推荐3】阅读与思考
下面是莉莉同学的数学学习笔记.请仔细阅读,并完成相应的任务.
任务:
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下面是莉莉同学的数学学习笔记.请仔细阅读,并完成相应的任务.
观察小猪的猪蹄,你会发现熟悉的几何图形,我们就把这个图形抽象地称为“猪蹄模型”.猪蹄模型中蕴含着角的数量关系.如图1, ![]() ![]() ![]() ![]() 证明:如图2,过点E作 ![]() ![]() ![]() ![]() ![]() ![]() 拓展应用:如图3, ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
(1)材料中的依据1是指:________________,依据2是指:________________.
(2)根据材料提供的方法,直接写出拓展应用的结果.
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【推荐1】已知△ABC中,∠B=2∠A,∠C=∠A+20°,求△ABC各个内角的度数.
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【推荐2】如图,点D在
上,点E在
上,
、
相交于点O.若
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e0ca93b81029af5c4cd3bbd0314ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a427709e6575431882877cda3b59ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/9a00b353-5b3c-436a-b336-e1959d08ed9f.png?resizew=164)
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名校
【推荐1】如图,点D在
上,
与
相交于点O,
,下面三个条件:①
;②
;③
,请你从①②③中选一个条件,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/1/fc196a53-d332-448e-92e8-096d6effbeb3.png?resizew=164)
(1)你添加的条件是______(填序号);
(2)添加了条件后,请证明
.
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(1)你添加的条件是______(填序号);
(2)添加了条件后,请证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03a43549ab71f0998fffbcb48397b00.png)
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解答题-作图题
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【推荐2】如图,是由小正方形组成的
网格,
的三个顶点
、
、
都在格点上.在给定的网格中,仅用无刻度的直尺,分别按下列要求画图,保留作图痕迹,不写画法.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/19dbcb37-4510-4f6b-b549-e1edf2b7e3f3.png?resizew=301)
(1)在图1中作
的中线
:
(2)在图2中作
的高线
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/19dbcb37-4510-4f6b-b549-e1edf2b7e3f3.png?resizew=301)
(1)在图1中作
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(2)在图2中作
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