一等腰三角形的一条边长为6,一个外角为120° , 则这个三角形的周长为_____ .
更新时间:2019-06-20 22:49:27
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【知识点】 等边三角形的判定和性质
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解题方法
【推荐1】如图,已知
中,
,D为
上一点,且
,则
的度数是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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填空题
|
适中
(0.65)
【推荐2】如图,
中,
,
,
,将
沿射线
的方向平移,得到
,再将
绕
逆时针旋转一定角度,点
恰好与点C重合,则平移的距离
为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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