小佳同学复习时将三角形按边长的等量关系整理成下表,请帮她在括号内填上一个适当的条件,该条件可以是________ .(填写一个条件即可)
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更新时间:2023-10-25 11:40:43
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【推荐1】如图,在△ABC中,AB=AC,∠A=120°,BC=6cm.若AB的垂直平分线交BC于点M,交AB于点E,AC的垂直平分线交BC于点N,交AC于点F,则MN=_________ .
![](https://img.xkw.com/dksih/QBM/2021/10/14/2829218162827264/2829739272683520/STEM/ca597c14-057a-4b14-97ef-e17e6743bb94.png)
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【推荐2】如图,
是边长为
的等边三角形,
是
内的任意一点,分别过点
作
分别交
,
于点
,
,作
分别交
,
于点
,
,作
分别交
,
于点
,
.则
的值为______ .
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