如图,在菱形ABCD中,∠BAD=120°,已知ΔABC的周长是15,则菱形ABCD的周长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/5a1e7a23-9d06-4c7f-b137-5cd5446f0167.png?resizew=186)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/5a1e7a23-9d06-4c7f-b137-5cd5446f0167.png?resizew=186)
A.10 | B.15 | C.20 | D.30 |
更新时间:2021-11-04 06:52:08
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【推荐1】如图,在⊙O中,弦AB等于⊙O的半径,OC⊥AB交⊙O于点C,则∠AOC等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/f060f5be-a530-4310-aff5-d0e66ec926f4.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/f060f5be-a530-4310-aff5-d0e66ec926f4.png?resizew=121)
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【推荐2】将含
角的直角三角板和直尺按如图所示的方式放置,已知
,点
,
表示的刻度分别为
,
,则线段
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c109cf538970b0f313a06feb5154494f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐1】如图,在
中,
,将
沿
折叠,使点
落在边
上的点
处,并且
,则
的长是( )
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715249660780544/2715299845963776/STEM/945455eff6b94a47838b1d5bd220f278.png?resizew=127)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/2021/5/6/2715249660780544/2715299845963776/STEM/945455eff6b94a47838b1d5bd220f278.png?resizew=127)
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【推荐2】如图,在平行四边形
中,对角线
,
相交于点O,
.若点E,F分别为
,
的中点,连接
,
,
,则四边形
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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