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S = 0.5*Sum(p[i].x * p[(i+1)%N].y - p[i].y*p[(i+1)%N].x)

Posted by Sempr at 2006-04-11 07:10:01 on Problem 2812
In Reply To:什么公式阿 我忘光了几何 Posted by:xiaxia at 2006-04-10 23:55:08 
希望没打错
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