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Re:见内!

Posted by v123 at 2006-04-22 20:46:43 on Problem 2242
In Reply To:见内! Posted by:davydc at 2006-02-17 21:09:19 
> 不是哪个圆是外接圆吗,然后外接圆圆心的那三个点的和的1/3吗,这可以求出半径了呀
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