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如图,AB∥CD,,△COD的周长为12cm,则△AOB的周长是 cm.
如图,AB∥CD,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103237478/SYS201311031017191032374029_ST/0.png)
,△COD的周长为12cm,则△AOB的周长是
cm.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101719103237478/SYS201311031017191032374029_ST/images1.png)
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