尺规作图(保留作图痕迹,不写作法)
已知:线段a,∠α
求作:△ABC,使AB=AC=a,∠B=∠α.
已知:线段a,∠α
求作:△ABC,使AB=AC=a,∠B=∠α.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/42500d91-bf1c-48d2-8baf-38eec032c975.png?resizew=108)
更新时间:2021-09-05 22:55:51
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解答题-作图题
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解答题-作图题
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【推荐2】已知P为
外一点,用直尺和圆规完成下列作图.(保留作图痕迹,写出必要的文字说明)
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(2)如图②,在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】在10×6的网格中建立如图的平面直角坐标系,△ABC的顶点坐标分别为A(0,3),B(6,3),C(4,6)仅用无刻度的直尺在给定网格中按要求完成画图.
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解答题-作图题
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【推荐2】阅读下列材料,完成相应任务.
已知:如图,直线
,点
在直线上.
求作:等边三角形
,使其点
,
分别落在直线
,
上.
作法:①在直线
上取点
,连接
,向右作等边三角形
,使点
落在直线
,
之间;
②在直线
上取点
(点
在点
左侧),作
交直线
于点
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③在射线
上截取
;
④连接
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,
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就是所求作的等边三角形.
![](https://img.xkw.com/dksih/QBM/2022/5/11/2977205602099200/2979112892088320/STEM/51a05eeb-a9fa-4fda-a7c3-51bed927a1ae.png?resizew=273)
(1)使用直尺和圆规,依上述作法补全图形(保留作图痕迹);
(2)请你根据上述作法,证明
所求作的等边三角形.
已知:如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d404d8add81119415aa84aa2c2e0125a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
求作:等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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作法:①在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5fdb83f1ed28796a2352a91756e990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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③在射线
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④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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