Poj Solution 2504

http://poj.org/problem?id=2504

/* @author: */
import java.util.Scanner;
public class Main{
 public static void main(String args[])
{
 Scanner sc=new Scanner(System.in);
int n;
double xx1,xx2,xx3,yy1,yy2,yy3,x,y,mnx,mxx,mny,mxy;
  
    int t=1;
    while(sc.hasNext())
    {
           n=sc.nextInt();
           if(n==0) break;
           xx1=sc.nextDouble();
           yy1=sc.nextDouble();
           xx2=sc.nextDouble();
           yy2=sc.nextDouble();
           xx3=sc.nextDouble();
           yy3=sc.nextDouble();
        double A1=2*(xx1-xx2);
        double A2=2*(xx1-xx3);
        double B1=2*(yy1-yy2);
        double B2=2*(yy1-yy3);
        double C1=xx1*xx1+yy1*yy1-xx2*xx2-yy2*yy2;
        double C2=xx1*xx1+yy1*yy1-xx3*xx3-yy3*yy3;
        double J=A1*B2-A2*B1;
        x=(C1*B2-C2*B1)/J;
        y=(A1*C2-A2*C1)/J;
        mnx=mny=999999999;
        mxx=mxy=-999999999;
        double angle=2*3.14159265358979/n;
        double xx,yy;
        for(int i=0;i< n;i++)
        {
         xx=Math.cos(i*angle)*(xx1-x)-Math.sin(i*angle)*(yy1-y)+x;
         yy=Math.sin(i*angle)*(xx1-x)+Math.cos(i*angle)*(yy1-y)+y;
         if(xx< mnx)mnx=xx; 
         if(xx>mxx)mxx=xx;
         if(yy< mny)mny=yy;
         if(yy>mxy)mxy=yy;
        }
        mxx=mxx-mnx;
        mxy=mxy-mny;
        System.out.printf("Polygon %d: %.3fn",t,mxx*mxy);
        t++;
    }
  }
}