如图,在平行四边形
中,点E,F分别在边
,
上,且
,连接
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc2a6b4d4ef7cb35ed683e6992563cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
21-22八年级下·广东汕尾·阶段练习 查看更多[16]
广东省汕尾市陆河县水唇中学2021-2022学年八年级下学期第三次综合训练数学试题(已下线)专题9.8 平行四边形(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)福建省福州外国语学校2022-2023学年九年级下学期期中数学试题福建省福州市台江区四校2022-2023学年八年级下学期期中适应性练习数学试题山东省临沂市郯城县2022-2023学年八年级下学期期中数学试题辽宁省大连市庄河市第七初级中学2022-2023学年八年级下学期第一次月考数学试题第25章 平行四边形 单元测试卷人教版(五四制)八年级下册数学2023年陕西省西安市铁一中学中考七模数学试题2023年广东省广州市第一中学中考二模数学试题福建省厦门市集美区灌口中学2022-2023学年八年级下学期第二次质量检测数学试卷(已下线)专题10 多边形与平行(特殊平行)四边形(36题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)专题15 多边形与平行四边形-学易金卷:2023年中考数学真题分项汇编(四川专用)江苏省苏州市吴江区苏州湾实验初级中学2022-2023学年八年级下学期3月月考数学试题(已下线)专题14 多边形与平行四边形-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)2022年福建省宁德市中考一模数学试题广东省惠州市河南岸中学2023-2024学年九年级下学期开学考试数学试题
更新时间:2023-10-13 00:12:46
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解答题-证明题
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适中
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名校
【推荐1】何老师在“空中课堂”视频中详细地为我们讲解了“将三角形绕图形的直角顶点旋转”的证明思路和方法.有这么一道题:已知:在四边形
中,
,
(1)如图1;若
的两边分别交射线
于点
,联结
.求证:
.
(2)如图2,
,且
,直接写出
;
(3)如图3,
,若
不是直角,
与
满足 ,
仍成立.请证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/6db4e1bd-a319-48a3-857b-b5a08368b984.png?resizew=618)
(1)如图1;若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e3785e09fcb0a8d425278d74de7d989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50687dc3ca6f4e7e8b29ef8af51eb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa7d487586e3702f55cd2d6466654bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24dfa37067ff455888ebe076eeb1fb2.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad73e0c38dd3080bad58a0b73f1d805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24dfa37067ff455888ebe076eeb1fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f585c8a84491d24cdbf724660d7b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24dfa37067ff455888ebe076eeb1fb2.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,在
的正方形网格中,点
都在格点上,仅用无刻度的直尺在给定网格中完成画图.
(1)在图1中过点
画出
的平行线
,并标出格点
;
(2)在图2中过点
画出
的垂线
,并标出格点
;
(3)图3中,在网格内与
有一条公共边且全等的所有格点三角形(不含
)的个数是___________.(不用画图,直接写出结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d009739b5b5362c7902eeeada94adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/e10bfd81-a1cd-40da-9eb8-b7f50e88ed4f.png?resizew=394)
(1)在图1中过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
(2)在图2中过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)图3中,在网格内与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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真题
【推荐1】如图,
中,点E是
的中点,连接
并延长交
的延长线于点F.
;
(2)点G是线段
上一点,满足
,
交
于点H,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
(2)点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f0f44d5995d4bb6195dd86c4909e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0914835057dfe8bd65516c2f7846d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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适中
(0.65)
【推荐2】如图,在
中,
是对角线,
,
,垂足分别为点
.
![](https://img.xkw.com/dksih/QBM/2020/4/26/2456242096431104/2456964049190912/STEM/8e47643c4685436098ea23bd6d6a046c.png?resizew=227)
(1)求证:
.
(2)若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2456242096431104/2456964049190912/STEM/8e47643c4685436098ea23bd6d6a046c.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2d49b55972ed3628129ae06a59d109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78ee2cb6caf7d7ee877796d18e53907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4953f64aead21c2a2e50a248d88c5a07.png)
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