2024七年级下·上海·专题练习
1 . 用直尺和圆规作一个角等于已知角的示意图如下,则要说明
,需要证明
和
,则这两个三角形全等的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7face39ae13e5ace885b20e1e1d71c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cc32412d97ae86924426339fb93cac.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 综合与探究
【操作探索】
在生活中,我们常用实物体验图形变换的过程.小颖同学利用一块风筝纸片完成了如下的操作:
如图1,已知四边形
,
,
.
(1)操作一:沿
所在的直线对折,如图1.你认为左右两侧对折后能完全重合吗?并说明理由;
(2)操作二:对折后,将风筝纸片剪成两个三角形(
和
),摆成如图2所示的图形,
与
相交于点
,
与
相交于点
.试说明
.
【应用拓展】
(3)如图3,在
中,
,
,点
在边
上,
,点
,
在线段
上,
,
,若
的面积为24,求
与
的面积之和.
【操作探索】
在生活中,我们常用实物体验图形变换的过程.小颖同学利用一块风筝纸片完成了如下的操作:
如图1,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
(1)操作一:沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)操作二:对折后,将风筝纸片剪成两个三角形(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6829c6214e60edbfbf1e31601c6bcb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
【应用拓展】
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2da1d50433aecf541991fd0f01773cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcff853a0873d0a6b93e4f90725752a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456e0f77d83975fdbdb60b499cb5b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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山西省太原市外国语学校、太原市实验学校等多校2023-2024学年七年级下学期月考数学试题陕西省榆林市子洲县周家硷中学2023-2024学年七年级下学期月考数学试题(已下线)专题03 三角形- 【暑假自学课】2024年新八年级数学暑假提升精品讲义(北师大版)
3 . 如图是用直尺和圆规作已知角的平分线的示意图,则说明
和
的全等的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,点A,F,C,D在同一条直线上,
,
,
,
和
全等吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bc0cc876a60c8cbdccc6a9a0b5b993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da8fe8f5f8a3f17561d70652ad1172a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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5 . 如图,已知
,点
为射线
上一点,用尺规按如下步骤作图:①以点
为圆心,以任意长为半径作弧,交
于点
,交
于点
;②以点
为圆心,以
长为半径作弧,交
于点
;③以点
为圆心,以
长为半径作弧,交前面的弧于点
;④连接
并延长交
于点
.则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95777a5aa465745ef2011bd042b3216.png)
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6 . 用直尺和圆规作一个角等于已知角的示意图如下,则要说明
,需要证明![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b535155f26b13777336e710afb0b5d6f.png)
________ (写出全等的简写).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40739e44a6759ab1a5524e2f8e3a2280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b535155f26b13777336e710afb0b5d6f.png)
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7 . 在如图所示的3×3网格中,
是格点三角形(即顶点恰好是网格线的交点),则与
有一条公共边且全等(不含
)的所有格点三角形的个数是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 某中学数学兴趣小组的同学在学习了三角形相关知识后,尝试了制作雨伞的实践活动.康康所在的小组设计了截面如图所示的伞骨结构,当伞完全打开后,测得
,E,F分别是
,
的中点,且
,那么
的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dacca19f76d406c300d549a5a35ce6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7a5fa34d4f207f93effbf9ce6fe88.png)
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9 . 如图,
的顶点
都在小正方形的顶点上,在格点
中选出一个点与点
、点
构成的三角形与
全等,则符合条件的点共有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf45856d69d28bf2c2f2a0293f448b2.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
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10 . 如图,在
和
中 ,
,
, 在不添加任何辅助线的条件下, 可判断
, 判断这两个三角形全等的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be269a5c2f54739884dbfaa364562d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f83fbec0cba7879555674a9561819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141b1338028500bba58b33a72f9d7138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb490d880679f0a8db7261836c44db74.png)
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2024-04-25更新
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343次组卷
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