如图,在等边三角形
中,
,点O在
上,且
,点D和点E分别在
,
上,
,
,则
的长是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348216467fda035329fe8fac46b39911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72d83915b41102495fcff91dbdbb0b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870db8090d5c4d194c25cf1355968f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7da595406d89ce8a442ee27a12eec9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/cf9aa169-7655-4fde-9695-e53b54fb7097.png?resizew=159)
更新时间:2024-02-28 10:46:54
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【推荐2】一个等边三角形至少要旋转___________ 度的角才能和原三角形重合;若等边三角形的边长为10cm,则它的面积是__________ .
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