如图,等边
中,
,D,E分别是
的中点,延长
到点F,使
,连接
,则四边形
的周长是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3677b2682fb3572f6f3ae7b7d8ad1e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
![](https://img.xkw.com/dksih/QBM/2022/7/25/3029934301757440/3040073576333312/STEM/bc6c8a88efb74d79af7262de2690cb8c.png?resizew=220)
更新时间:2022-08-08 13:48:26
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【推荐1】如图,Rt△ABC中,∠ABC=90°,∠BAC=30°,BA=2
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