如图,在
中,
,把
绕着点B顺时针旋转得到
,点C的对应点D落在
上,连接
.
,求
的长;
(2)若D为
的中点,求证:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b29a1d39a258d9d0de0e3f4fefbdbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
23-24九年级上·浙江台州·期末 查看更多[2]
浙江省台州市路桥区2023-2024学年九年级上学期期末数学试题(已下线)专题04 图形的平移与旋转(9大题型+优选提升题)-备战2023-2024学年八年级数学下学期期末真题分类汇编(北师大版)
更新时间:2024-02-09 10:36:31
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解答题-作图题
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【推荐1】如图,在Rt△ABC中,∠C=90°,∠A=28°.
(1)作AC边上的垂直平分线DE,交AC于点D,交AB于点E(用直尺和圆规作图,不写作法,但要保留作图痕迹);
(2)连接CE,求∠BCE的度数.
(1)作AC边上的垂直平分线DE,交AC于点D,交AB于点E(用直尺和圆规作图,不写作法,但要保留作图痕迹);
(2)连接CE,求∠BCE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/61035f79-604d-48ba-9772-252b20d63d7b.png?resizew=154)
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解答题-问答题
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【推荐2】如图,△ABC中,AB=AC,DE是腰AB的垂直平分线.
(1)若∠A=40°,求∠DBC的度数;
(2)若AB=9,BC=5,求△BDC的周长.
(1)若∠A=40°,求∠DBC的度数;
(2)若AB=9,BC=5,求△BDC的周长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/231411cc-cb28-4d3b-ae4f-6b05c70c8ee9.jpg?resizew=129)
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解答题-证明题
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【推荐1】如图,
是
的直径,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/d0e45444-6ca9-4886-86a6-c0dea3815e34.png?resizew=130)
求证:
(1)
;
(2)
是等边三角形;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/d0e45444-6ca9-4886-86a6-c0dea3815e34.png?resizew=130)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75582a86b2b09db7221f22c7fcb35362.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccac9fe057122d775256a56577abd46f.png)
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【推荐2】如图,
,
平分
,C为角平分线上一点,过点C作
,垂足为C,交
于点D,
交
于点E.判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/30d2304c-f006-43c0-8dbf-542e5484da78.png?resizew=174)
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解答题-问答题
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【推荐1】如图,在四边形ABCD中,AB = 3,BC = 4,CD = 8,AD =
,∠ACD = 90°,求∠B的度数.
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/12/aaaa9130-b591-49c7-9971-da003ace8026.png?resizew=220)
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解答题-证明题
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【推荐2】在锐角三角形
中,点D、E分别在边
、
上,
于点F,
于点G,
.
;
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16cc20b0d24b7a2f4dcc3d337a76b661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5712e6f244fffb3a5de73f3aa56014c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c30583f2a4aca915134f41b452e4e7d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6cee83d36c4da913e0790e5070c46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929adbe2211b012b66fe725d478274c3.png)
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解答题-作图题
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【推荐1】如图,方格纸上的小正方形的边长均为1个单位长度,点A,B都在格点上(两条网格线的交点叫格点),请用无刻度直尺完成下列问题:
(1)在图中画出线段AB的中点C;
(2)将线段AB绕点A逆时针旋转90°,得到旋转后的线段AB';
(3)在线段AB'上画出点D,使△ABD面积为
.
(1)在图中画出线段AB的中点C;
(2)将线段AB绕点A逆时针旋转90°,得到旋转后的线段AB';
(3)在线段AB'上画出点D,使△ABD面积为
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解答题-问答题
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【推荐2】如图1,抛物线
分别交
轴于
,
两点,且与
轴交于点
.
的坐标.
(2)如图2,将该抛物线绕点
旋转
.
①求旋转后的抛物线的表达式.
②旋转后的抛物线顶点坐标为
,且与
轴的右侧交于点
,顺次连接
,
,
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204696a289b1f47a176eb16c1cecf8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)如图2,将该抛物线绕点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
①求旋转后的抛物线的表达式.
②旋转后的抛物线顶点坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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