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好像这个不一定....或者这样说 ---->

Posted by welkin_fafnir at 2005-07-21 10:27:41 on Problem 2500
In Reply To:一个疑问 Posted by:welkin_fafnir at 2005-07-21 10:17:34 
n个点把圆周n等分
任取一个点A
取剩下点中的中间点B
以AB为对角线的四边形的面积一定不小于以A为对角线的一个端点但是另个端点非B的四边形面积？
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