引入概念1:如果一个三角形的三个角分别等于另一个三角形的三个角,那么称这两个三角形互为“等角三角形”.
引入概念2:从不等边三角形一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形.若分成的两个小三角形中一个是满足有两个角相等的三角形,另一个与原来三角形是“等角三角形”,我们把这条线段叫做这个三角形的“等角分割线”.
(1)如图1,在
中,
,
,请判断
与
(填“是”或“否”) 为“等角三角形”.
(2)如图2,在
中,
为角平分线,
,
.
请你说明
是
的等角分割线.
【应用概念】:
(3)在
中,若
,
是
的等角分割线,请你直接写出所有可能的
度数.
引入概念2:从不等边三角形一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形.若分成的两个小三角形中一个是满足有两个角相等的三角形,另一个与原来三角形是“等角三角形”,我们把这条线段叫做这个三角形的“等角分割线”.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
请你说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【应用概念】:
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
23-24七年级下·江苏苏州·期中 查看更多[2]
江苏省苏州市苏州工业园区金鸡湖学校2023-2024学年七年级下学期期中数学试题(已下线)第5章 生活中的轴对称 全章热门考点专练(4个知识必学2个方法必会)-2023-2024学年七年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(北师大版)
更新时间:2024-04-24 09:39:03
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】(1)如图:若
,点
在
、
内部,则
、
、
之间有何数量关系?请证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591625228288/2465919816237057/STEM/43de5d79-d168-4856-bcff-c96526b209ab.png?resizew=223)
(2)如图,若
,将点
移到
、
外部,则
、
、
的数量关系是______.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591625228288/2465919816237057/STEM/5809a237-cdd3-41cf-94b6-1ea75c2057c8.png?resizew=253)
(3)在下图中,将直线
绕点
逆时针方向旋转一定角度交直线
于点
,则
、
、
、
之间满足的数量关系是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591625228288/2465919816237057/STEM/43de5d79-d168-4856-bcff-c96526b209ab.png?resizew=223)
(2)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591625228288/2465919816237057/STEM/5809a237-cdd3-41cf-94b6-1ea75c2057c8.png?resizew=253)
(3)在下图中,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/6fbf1667b21a273bf5dd007d65eeda7c.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/eb3de20ba8bda63c650ef571be155702.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591625228288/2465919816237057/STEM/df97e726-3ecc-4db0-b87e-801c192c6da3.png?resizew=253)
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解答题-证明题
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适中
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【推荐2】如下图,等边
与等边
的顶点
,
,
三点在一条直线上,连接
交
于
点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/eb10adbf-2b02-403e-b813-ec2b5f751c55.png?resizew=419)
(1)求证:
平分
;
(2)求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/eb10adbf-2b02-403e-b813-ec2b5f751c55.png?resizew=419)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acb6b5359a901c5b5a71f32f7f6ca32.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7234143e2ec26683705f73caea16a194.png)
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【推荐3】如图1,我们把一副两个三角板如图摆放在一起,其中OA,OD在一条直线上,∠B=45°,∠C=30°,固定三角板ODC,将三角板OAB绕点O按顺时针方向旋转,记旋转角∠AOA'=α(0<α<180°).
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884882115362816/2885878229630976/STEM/f36729a741dd4397a2b6d20e3499414c.png?resizew=488)
(1)在旋转过程中,当α为 度时,A'B'
OC,当α为 度时,A'B'⊥CD;
(2)如图2,将图1中的△OAB以点O为旋转中心旋转到△OA'B'的位置,求当α为多少度时,OB'平分∠COD;
拓展应用:
(3)当90°<α<120°时,连接A'D,利用图3探究∠B'A'D+∠B'OC+∠A'DC值的大小变化情况,并说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884882115362816/2885878229630976/STEM/f36729a741dd4397a2b6d20e3499414c.png?resizew=488)
(1)在旋转过程中,当α为 度时,A'B'
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如图2,将图1中的△OAB以点O为旋转中心旋转到△OA'B'的位置,求当α为多少度时,OB'平分∠COD;
拓展应用:
(3)当90°<α<120°时,连接A'D,利用图3探究∠B'A'D+∠B'OC+∠A'DC值的大小变化情况,并说明理由.
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解答题-问答题
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适中
(0.65)
【推荐1】在
中,
,点
是直线
上的一点(不与点
、
重合),以
为腰右侧作等腰三角形
,且
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/c00b6354-3276-4b94-8963-72a3b1c8734d.png?resizew=370)
(1)如图1,当点
在线段
上,如果
,则
度.
(2)设
,
.
①点
是在线段
上移动时,如图2,则
、
之间有怎样的数量关系?试说明理由.
②点
是在射线
上移动时,则
、
之间有怎样的数量关系?试直接写出结论.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/c00b6354-3276-4b94-8963-72a3b1c8734d.png?resizew=370)
(1)如图1,当点
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753dbb5a670dd4f5e23bb919e44dda2.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49dca0cc635668c549ec80c1d893ed4.png)
①点
![](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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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【推荐2】如图,已知
,
是
的高和角平分线,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd3da5746073b10e530e7b07319b1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/d8b1b114-6009-4cac-a101-9fbc341ef533.png?resizew=143)
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解答题-作图题
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适中
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名校
【推荐1】如图,
中,
, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2457c9087070840f4a2ec177cbb676f8.png)
(1)尺规作图:作
边的垂直平分线
交
于点
,交
于点
.(保留作图痕迹,不要求写作法和证明);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef14126f9e6feefa2743f73557aedb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2457c9087070840f4a2ec177cbb676f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/b7d119b4-8a8f-44be-b63f-bd941df44573.png?resizew=146)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681b593dba5d76f3de43e8dd41a13fc8.png)
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【推荐2】如图,在△ABC中,AB=AC,∠A=36°,BD平分∠ABC,DE⊥AB于点E.若CD=4,且△BDC的周长为24,求AE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/dcd37bbf-d45f-4b1e-973f-e2e2f14796e5.png?resizew=133)
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