已知:如图,
,
,
,连接
,
,
,过点
作
于点
.过点
作
的高线
,交
的延长线于点
.
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb81e4422c0befeecef0d0441323b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7090c23bac414614f24d281333337f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11c1db76cc7e1894f74a50d71736455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/7d97822c-5fc4-48bd-b5de-e944ad074d1a.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6642078b32134cc865db795a91faeb8.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf7a961a55aa7f225fadb6a25a60c75.png)
更新时间:2024-01-10 15:45:39
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知:AB=AC,BE=CD.
(1)如图1,求证:∠B=∠C;
(2)如图2,连接AO,不添加任何辅助线,直接写出图中所有的全等三角形.
(1)如图1,求证:∠B=∠C;
(2)如图2,连接AO,不添加任何辅助线,直接写出图中所有的全等三角形.
![](https://img.xkw.com/dksih/QBM/2020/10/9/2567453362102272/2568506083835904/STEM/b890c547-5760-4256-9a1c-1669c198dede.png?resizew=368)
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解答题-问答题
|
适中
(0.65)
【推荐2】综合与实践
问题情境:
数学活动课上,老师组织同学们以“矩形”为主题开展数学活动.
已知矩形
的一条对称轴分别交这
,
于点
,
,如图①,奋进小组进行了如下的操作:以点
为圆心,
的长为半径作弧,交边
于点
,已知点
在弧
上运动(含
,
两点),运接
,将分别以点
、
为圆心,大于
的长为半径作弧,两弧相交于点
,作射线
交
于点
.
提出问题:
(1)如图②,填空:若点
运动到
上时,则
的度数为______;
拓展应用:
(2)如图③,励志小组在图②的基础上进行如下操作:连接
并延长交
于点
,请判断
的形状,并说明理由;
解决问题:
(3)创新小组在图③的基础上进行如下操作:延长
交边
于点
,
,
,当
是直角三角形时,请直接写出
的值.
问题情境:
数学活动课上,老师组织同学们以“矩形”为主题开展数学活动.
已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2c6c3cc1875ad112d8c4eac793337c.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db7caf3b5c26b934363f0a3f9023261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/c6be66ec-2f28-4bc3-98e0-0ba6bd98c14f.png?resizew=640)
提出问题:
(1)如图②,填空:若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413d8d82deb8f0ee10703db2bd156921.png)
拓展应用:
(2)如图③,励志小组在图②的基础上进行如下操作:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9555c0b7d2f237b1915101bc75e6140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90691a2b85ad33b42e5d5c3f7ce06941.png)
解决问题:
(3)创新小组在图③的基础上进行如下操作:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f483a71f250bac98cb05d67dccad14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】类比于等腰三角形的定义,我们定义:有组邻边相等的凸四边形叫做“等邻边四边形”.
的顶点
、
、
在网格格点上,请你在
的网格中分别画出
个不同形状的等邻边四边形
要求顶点
在网格格点上.
(2)如图2,在平行四边形
中,
是
上一点,
是
上一点,
,
,请说明四边形
是“等邻边四边形”;
(3)如图3,在平行四边形
中,
,
平分
,交
于点
,
,
,
是线段
上一点,当四边形
是“等邻边四边形”时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/d6a81f874fe42d51a43f63d013b7caa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1ca3d89a7eb6e8bf9ce7c1b14b6024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868f239e31d1021437dd9d2f8a2702bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a965aa682d6d2aa484a43d4941c91.png)
(3)如图3,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f52dbad9494cac359ecebe70230e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa783be67f9c5bb06c08796ce22f82c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6813cfccfba3043fc567b0dadf76d229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b54a965aa682d6d2aa484a43d4941c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,
是
中点,
.
求证:(1)
;
(2)
是等腰直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/04f8eebda19eded2b059774a8c2666c3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/476c47c9-41a9-4b62-99b4-c8336283135f.png?resizew=159)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点,A、B、C三点是格点,点D是线段
与竖网格线的交点.仅用无刻度的直尺在给定网格中完成画图.
的角平分线
,再在
上画点Q,使
;
(2)在图2中,连接
,画
的中点M;
(3)在图3中,在
上画点E,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a96e9c2e2a15130d1d56a1d0e16b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/620220181c13137f0ea41502b934e6ec.png)
(2)在图2中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)在图3中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6328ff643e255f79ca418967e1e878b.png)
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