如图所示,在
中,
,点
分别在
上,且
与
交于点 F.
是等边三角形;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fbe188222b86447706a6ba8366d825.png)
(3)求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89cf6bb35d9191f23e76c540f6ff7a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf021aeca0c3cacd4bbffd7479a1e25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ffa3f397b0f9f0bdda56a07b5c3ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fbe188222b86447706a6ba8366d825.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
23-24八年级上·天津宁河·期中 查看更多[2]
天津市宁河区2023-2024学年八年级上学期期中数学试题(已下线)专题5.9 生活中的轴对称(全章知识梳理与考点分类讲解)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2024-06-02 17:03:20
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【推荐1】在四边形
中,
是边
上的一点.若
,则点
叫做该四边形的“等形点”.
(2)如图,在四边形
中,边
上的点
是四边形
的“等形点”.已知
,
,
,连接
,求
的长;
(3)在四边形
中,EH//FG.若边
上的点
是四边形
的“等形点”,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095fd8dfd68e8da984ea37b38442fcd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5713d1a64003579a8daec80c5a55b939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11ccdb7fd71ddc0fdd3152763e9e46e.png)
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【推荐2】如图,把△ACE绕点C逆时针旋转60°后与△BCD重合,BD、AE交于点 M,连接AB、DE.
(1)求证:△ABC和△CDE为等边三角形;
(2)求∠AMB的度数.
(1)求证:△ABC和△CDE为等边三角形;
(2)求∠AMB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/e9c491aa-cb4b-4f1a-a3df-daab3cd7b864.png?resizew=222)
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【推荐1】如图,在Rt△ABC中,∠BAC=90°,AB=AC,点D是△ABC内一点,连结AD,将线段AD绕点A逆时针旋转一定角度得到线段AE使∠BAD=∠CAE(E在AC右侧),连结BD,CE.
![](https://img.xkw.com/dksih/QBM/2016/1/29/1573966774558720/1573966780276736/STEM/312312929dd3422aa34bea9dfeb39757.png)
(1)求证:BD=CE;
(2)若AD=2,求点D绕点A旋转到点E所经过的路径长.
![](https://img.xkw.com/dksih/QBM/2016/1/29/1573966774558720/1573966780276736/STEM/312312929dd3422aa34bea9dfeb39757.png)
(1)求证:BD=CE;
(2)若AD=2,求点D绕点A旋转到点E所经过的路径长.
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解题方法
【推荐2】如图,在等腰△ABC与等腰△ADE中,AB=AC,AD=AE,∠BAC=∠DAE=α,连接BD和CE相交于点P,交AC于点M,交AD于点N.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898389158649856/2917729776623616/STEM/5e622621-e978-4d7e-8c45-a60e7584ee1f.png?resizew=275)
(1)求证:BD=CE.
(2)求证:AP平分∠BPE.
(3)若α=60°,试探寻线段PE、AP、PD之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898389158649856/2917729776623616/STEM/5e622621-e978-4d7e-8c45-a60e7584ee1f.png?resizew=275)
(1)求证:BD=CE.
(2)求证:AP平分∠BPE.
(3)若α=60°,试探寻线段PE、AP、PD之间的数量关系,并说明理由.
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【推荐1】如图,△ABC中,∠ABC=60°,分别以AB,AC为边向三角形外作等边△ABD和等边△ACE,解答下列各题,并要求标注推导理由:
(1)如图1,求证:AD∥BC;
(2)如图2,连接CD、BE,求证:DC=BE;
(3)如图3,若∠ACB=90°,连接DE,交AB于点F,求证:DF=EF.
(1)如图1,求证:AD∥BC;
(2)如图2,连接CD、BE,求证:DC=BE;
(3)如图3,若∠ACB=90°,连接DE,交AB于点F,求证:DF=EF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/30e6563f-6ea0-47f8-a7e6-b3831021ddcb.png?resizew=629)
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【推荐2】已知:如图所示,
为等边
内一点,
,
,试说明以
,
,
为边长可以构成一个三角形,并确定所构成三角形的各内角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83242902c24f0fe325a9f0ace9aa633.png)
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![](https://img.xkw.com/dksih/QBM/2014/11/21/1573758223384576/1573758229069824/STEM/dde63d48-4890-4058-9169-1e494d23cb66.png?resizew=168)
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【推荐1】△ABC的三边a、b、c满足:
,则△ABC是什么三角形?试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499547f54aaddae89f1de0ed1aac46bd.png)
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【推荐2】综合与实践
问题情境:在数学实践课上,老师让小组合作探究两个完全相同的含30°角的三角板拼图间存在的关系.
如图,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/1088d271-535d-4954-87ca-4b2251acc2ca.png?resizew=430)
操作探究:
(1)如图1,当D,C,B在同一条直线时,直线
与直线
的位置关系是______;
(2)如图2,将图1中的三角板
绕点C顺时针旋转
,边
与边
交于点G,此时
与
的位置关系是______,判断此时
的形状并证明;
(3)如图3,将图1中的三角板
绕着点C顺时针旋转,边
与边
交于点M,当
是以
为腰的等腰三角形时,求
的长.
问题情境:在数学实践课上,老师让小组合作探究两个完全相同的含30°角的三角板拼图间存在的关系.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d76e0315b1e11914db3dcf3b4e7f80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fbc42ea04e6ae3b868f218785c9bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9261cb9e2b240e14c11105289911a1ed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/1088d271-535d-4954-87ca-4b2251acc2ca.png?resizew=430)
操作探究:
(1)如图1,当D,C,B在同一条直线时,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图2,将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaecf08a22124a457128fb04c9c02bb.png)
(3)如图3,将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678b28fddb166d90878d24d6e5481080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8045b729b7f257861057191a8a2388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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