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很明显就是有人不知道/不记得这个公式

Posted by frkstyc at 2008-05-07 15:39:24 on Problem 3587
In Reply To:外接圆半径等于三边长乘积除以面积的四倍。为什么用sin??? Posted by:alpc62 at 2008-05-07 14:17:13


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