如图,在矩形ABCD中,AB=5cm,且∠BOC=120°,则AC 的长为__________
![](https://img.xkw.com/dksih/QBM/2013/1/9/1573585298079744/1573585323687936/STEM/da167e5d814c401d838e6c448712640c.png?resizew=174)
更新时间:2016-12-05 15:30:26
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【推荐2】矩形的两条对角线的夹角为60°,一条对角线与短边的和为15,则长边的长为____ .
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【推荐1】已知:如图,正方形
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