【问题呈现】如图1,在四边形
中,
.作一个等边三角形,使它的顶点落在四边形
的边上,其中至少有一个顶点与四边形的顶点重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/691f3ea3-8c02-46b8-92fd-83403f785641.png?resizew=451)
【操作探究】
(1)如图2,小安仅用无刻度的直尺和圆规作图,步骤如下:
①分别以A,B为圆心,大于
长为半径画弧,两弧相交于M,N两点,作直线
交
于点E.
②以点E为圆心,
的长为半径画弧交
于点F
③连结
,
.
求证:
是等边三角形.
(2)用不同于小安的作图方法在图1中作一个等边三角形,其中一个顶点为D(要求:尺规作图,保留作图痕迹,不写作法和证明)·
(3)如图3,若
,求等边三角形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c79fd5c639bb04df2196dc4dc6bc77bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/691f3ea3-8c02-46b8-92fd-83403f785641.png?resizew=451)
【操作探究】
(1)如图2,小安仅用无刻度的直尺和圆规作图,步骤如下:
①分别以A,B为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
②以点E为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
③连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
(2)用不同于小安的作图方法在图1中作一个等边三角形,其中一个顶点为D(要求:尺规作图,保留作图痕迹,不写作法和证明)·
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2e849b7a9ed83767c5090226cbb516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3cb490fa5c17e73e84492fa2fd94ca.png)
更新时间:2024-02-28 16:05:10
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问题探究:
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平分
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