如图,△ABC中,D、E是AB上的两点,△CDE是等边三角形,∠ACB=120°.求证:
(1)△ABC∽△ACD;
(2)△ACD∽△CBE;
(3)DE2=AD•BE.
(1)△ABC∽△ACD;
(2)△ACD∽△CBE;
(3)DE2=AD•BE.
![](https://img.xkw.com/dksih/QBM/2021/12/15/2873042593415168/2875224665522176/STEM/80925cd3bb69485b9cf6110b2687235c.png?resizew=271)
更新时间:2021-12-18 16:02:28
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【推荐1】如图,
是等边三角形,点
分别在
上,
与
相交于点
.
;
(2)在线段
的延长线上求作一点P,使得
.(要求:尺规作图,保留作图痕迹)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebac98bc0eb0ee0dfc17d90cb2dbda1a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9ac483e4c87ee716597262e99e95c4.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf3a9bc2daab1f386ec116d74b703.png)
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【推荐2】(1)操作发现:如图①,点D是等边△ABC的边AB上一动点(点D与点B不重合),连接CD,以CD为边在CD上方作等边△CDE,连接AE,则AE与BD有怎样的数量关系?说明理由.
(2)类比猜想:如图②,若点D是等边△ABC的边BA延长线上一动点,连接CD,以CD为边在CD上方作等边△CDE,连接AE,请直接写出AE与BD满足的数量关系,不必说明理由;
(2)类比猜想:如图②,若点D是等边△ABC的边BA延长线上一动点,连接CD,以CD为边在CD上方作等边△CDE,连接AE,请直接写出AE与BD满足的数量关系,不必说明理由;
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【推荐1】如图,四边形ABCD内接于⊙O,AD、BC的延长线相交于点E.△ABE与△CDE相似吗?为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/21aeaa5f-b69c-4582-ba69-0352082230e6.png?resizew=102)
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