问题发现:
如图1,在
中,
,
,D为BC边上一点(不与点B,C重合),将线段AD绕点A逆时针旋转60°得到AE,连接EC,则:
的度数是______;②线段AC,CD,CE之间的数量关系是______;
拓展探究:
(2)如图2,在
中,
,
,D为BC边上一点(不与点B,C重合),将线段AD绕点A逆时针旋转90°得到AE,连接EC,请写出
的度数及线段AD,BD,CD之间的数量关系,并说明理由;
解决问题:
(3)如图3,在
中,
,
,
,若点A满足
,
,求线段AD的长度.
如图1,在
![](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/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
拓展探究:
(2)如图2,在
![](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/421456e82c859184328587723f85034d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
解决问题:
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2eece85313176545a1e924b8328427b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a9b1d39efca82ac0f3bf059e49b103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b77d8d2a99713b192dc729ddc2275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
更新时间:2024-01-14 23:25:46
|
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解答题-问答题
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适中
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名校
【推荐2】如图1,已知点
在同一直线上,
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都是等边三角形,
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![](https://img.xkw.com/dksih/QBM/2020/8/18/2530515652132864/2531020153495552/STEM/57b79479-a819-469f-9c1c-027fe50ad1d5.png)
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(3)若将
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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□
,
为
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适中
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【推荐3】项目式学习.
用固定双曲线三等分锐角 | ||
文化背景 | 三等分角大约是在公元前五世纪由古希腊人提出来的,它和“立方倍积问题”“化圆为方问题”一起被称为“古代三大几何难题”.古希腊数学家帕普斯(![]() ![]() | |
任务设定 | 用直尺和圆规三等分锐角∠AOB | |
解决途径 | (1)以点O为坐标原点,![]() (2)在平面直角坐标系中,绘制反比例函 ![]() ![]() ![]() (3)以点 C为圆心, ![]() ![]() (4)分别过点 C 和 E 作 x轴和y轴的平行线,两线交于点 D,F; (5)作射线 ![]() ![]() ![]() | |
问题解决 | ||
任务1 | 四边形![]() | |
任务2 | 请证明.![]() |
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解答题-证明题
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适中
(0.65)
【推荐1】如图,菱形
的对角线
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为矩形;
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于点F,连接
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解答题-问答题
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适中
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【推荐2】已知,△ABC中,AC=BC,∠ACB=90°,CD为边AB上的中线,若E是线段CA上任意一点,DF⊥DE,交直线BC于F点.G为EF的中点,连接CG并延长交直线AB于点H.
(1)试说明:①AE=CF; ②CG=GD;
(2)若AE=6,CH=10,求边AC的长.
(1)试说明:①AE=CF; ②CG=GD;
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,在等边
中,点
是
边上一点,连接
,将线段
绕点
按顺时针方向旋转
后得到
,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-问答题
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适中
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【推荐2】在平面直角坐标系
中,将点
先向右平移1个单位长度,再向下平移3个单位长度得到点B.
(1)求直线
对应的函数表达式;
(2)将直线
______可以得到函数
的图像.(填写所有正确的序号)
①向右平移6个单位长度;
②向下平移6个单位长度;
③绕点
按逆时针方向旋转
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④先向左平移1个单位长度,再向下平移3个单位长度.
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(1)求直线
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(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8262240fd443ffde3d0a0533144d342.png)
①向右平移6个单位长度;
②向下平移6个单位长度;
③绕点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
④先向左平移1个单位长度,再向下平移3个单位长度.
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