如图1,已知线段
、
相交于点O,连接
、
,则我们把形如这样的图形称为“8字型”.
.
(2)如图2所示,
,则
的度数为 .
(3)如图3,若
和
的平分线
和
相交于点P,且与
,
分别相交于点M,N.
①若
,
,求∠P的度数.
②若角平分线中角的关系改成“
,
”,试直接写出
与
,
之间存在的数量关系,并证明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/ce9b8545cc98514bd081766eb2bfaf0b.png)
(2)如图2所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0440e79b4b817a2c7d9d05089962ae72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7cc870cceb6d09d0f38cebdb131e72.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a32af9c7baa934baaebbbc0562cf7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e459e24a3c880c0aaa155e56a8dde9c.png)
②若角平分线中角的关系改成“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4339369ce774ee13cb835896c83a5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45458d3c2238ed598d922b3975b76353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
2023七年级下·江苏·专题练习 查看更多[7]
(已下线)(培优特训)专项7.7 三角形有关角度的经典模型必刷-2022-2023学年七年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)专题02 平面图形的认识(二)平移、三角形、多边形(考点串讲+十一个类型)-2022-2023学年七年级数学下学期期中期末考点大串讲(苏科版)(已下线)重难点02 三角形(五种模型)-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(苏科版)(已下线)重难点02 三角形(五种模型)-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(沪教版)四川省巴中市巴州区2022-2023学年七年级下学期5月月考数学试题河南省洛阳市偃师市洛阳偃师中成外国语学校2022-2023学年七年级下学期期末数学试题福建省漳州市华安县第一中学2023-2024学年七年级下学期月考数学试题
更新时间:2023-04-21 09:16:35
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相似题推荐
解答题-问答题
|
较难
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名校
【推荐1】如图1,在平面直角坐标系内,直线
与
轴正半轴交于点
,与
轴正半轴交于点
,点
是
轴负半轴上一点,点
是直线
上位于第四象限内的一点,直线
经过原点
,且
平分
,
的平分线与直线
交于点
,
的平分线与直线
交于点
.
(1)判断
与
的位置关系,并说明理由;
(2)在
,
,
中,如果有一个角是另一个角的4倍,直接写出
的度数:__________;
(3)如图2,当
取(2)结论中的最大值时,过点
作
交直线
于点
,点
是直线
上一点且
,现将
绕点
逆时针旋转
度,
得到
,射线
交直线
于点
,
的平分线交直线
于点
,在旋转过程中,是否存在
,使得
,若存在,请直线写出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/81dea63b8ce3e51adf66cf7b9982a248.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/49254cda-309e-4948-bfa2-7928880d1202.png?resizew=444)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5b0adb655532ef12b711707e2b9e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22921d02cb620381690de05b72fc765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5319c8789ed26eae08af6c51e9135c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a214ac0f8a3688f7c699b353c72a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e07b1eda2a15003c9c387b4084e82d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9a2077ea586ec2ee3ea6106a9b1327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-问答题
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【推荐2】如图,一副三角板的边
在直线
上,直角顶点C、M分别在直线
的上方和下方,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/4e3e1b73-8d11-4a26-9ed4-01f276c3cd92.png?resizew=615)
(1)将图1中的三角板
绕点O逆时针旋转
,则
;
(2)将图1中的三角板
绕点O按逆时针方向旋转到图2的位置,使
在
的内部,求
的度数;
(3)将图1中的三角板
同时绕点O按逆时针方向旋转,速度分别为每秒
和每秒
,当三角板
第一次旋转到起始位置时,一副三角板都停止运动.设运动时间为t秒,当直线
恰好平分
时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9eebf3ad4e91299cde6cf431e99f791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f12c14234824016781fc79e642eb08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/4e3e1b73-8d11-4a26-9ed4-01f276c3cd92.png?resizew=615)
(1)将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1eb76f88cb973c220cffa1c9c0721a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78a438d58f7a7ba0f54f7f9728c3628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1eb76f88cb973c220cffa1c9c0721a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c125e4f9b7d871d2f608f71be4ee4d6.png)
(3)将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a064e78e719fb2502617634f3b2d7258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1eb76f88cb973c220cffa1c9c0721a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
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解答题-证明题
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【推荐1】某数学小组在一次数学探究活动过程中,经历了如下过程:
问题提出
如图,在正方形
中,P为对角线
上一点,连接
,将
绕点P逆时针旋转
,得到
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/ef377c49-a7df-4926-befd-056e57819594.png?resizew=242)
(1)操作发现
当
时,
的度数为 ;
(2)数学思考
当
时,连接
,求证:
为直角三角形;
(3)拓展应用
若正方形的边长为4,直接写出
的最大值.
问题提出
如图,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/ef377c49-a7df-4926-befd-056e57819594.png?resizew=242)
(1)操作发现
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce9892aae4829800691133e9f53c86b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028012ef88546694cd67ac0d44bf6725.png)
(2)数学思考
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867beccc3dc4bf90ba2797a2af801da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e8ecb371ce77dca5554e8e03b41386.png)
(3)拓展应用
若正方形的边长为4,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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解答题-证明题
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较难
(0.4)
【推荐2】已知△ABC≌△EDC,过点A作直线l∥BC;
(1)如图1,点D在线段AC上时,点E恰好落在直线l上点A的右侧,求∠ACB的度数;
(2)如图2,在(1)的条件下,连接BE交AC于点F,G是线段CE上一点,且满足CG=CF,连接DG交EF于点H,连接CH.求证:
;
(3)如图3,∠ACB大小与(1)中相同,当点D不在线段AC上时,且点F、点G、点H满足(2)中条件,点M,N分别为线段CE,GD的延长线与直线l的交点.请直接写出△GMN为等腰三角形时,∠EBC与∠BCD满足的数量关系.
(1)如图1,点D在线段AC上时,点E恰好落在直线l上点A的右侧,求∠ACB的度数;
(2)如图2,在(1)的条件下,连接BE交AC于点F,G是线段CE上一点,且满足CG=CF,连接DG交EF于点H,连接CH.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9621b286cd6faaeea90bd507a6da16ba.png)
(3)如图3,∠ACB大小与(1)中相同,当点D不在线段AC上时,且点F、点G、点H满足(2)中条件,点M,N分别为线段CE,GD的延长线与直线l的交点.请直接写出△GMN为等腰三角形时,∠EBC与∠BCD满足的数量关系.
![](https://img.xkw.com/dksih/QBM/2021/9/4/2801039912189952/2803837010100224/STEM/29a16b35-e007-4c36-a7b2-f5048815f0c3.png?resizew=638)
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解答题-问答题
|
较难
(0.4)
【推荐1】在
中,
,
,
,点
是线段
延长线上的动点,点
是线段
上的动点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/237a9539-8609-4d37-8547-d9d5255d3090.png?resizew=505)
(1)如图1,若
≌
,求线段
的长;
(2)已知
,如图2.
①设线段
,求线段
的长(用含
的式子表示);
②设
与
的平分线相交于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/237a9539-8609-4d37-8547-d9d5255d3090.png?resizew=505)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2556d8a3c762f55138aa3afceedd72.png)
①设线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede69346d90f2c2c7d738d90c6aa60a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fa5dff377ef08e416547def489def0.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,已知四边形ABCD为正方形,点E是边AD上任意一点,△ABE按逆时针方向旋转一定角度后得到△ADF,延长BE交DF于点G,且AF=4,AB=7.
(1)请指出旋转中心和旋转角度;
(2)求BE的长;
(3)试猜测BG与DF的位置关系,并说明理由.
(1)请指出旋转中心和旋转角度;
(2)求BE的长;
(3)试猜测BG与DF的位置关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118774568812544/2119113590317056/STEM/811026614d02492083125a1f3cf801bc.png?resizew=184)
您最近一年使用:0次