#include <stdio.h>

using namespace std;

FILE*f=fopen("triang.in","r");
FILE*g=fopen("triang.out","w");

struct pct
{
    double x,y;
}v[1510];

int cmp(pct a,pct b)
{
    if (a.x<b.x||(fabs(a.x-b.x)<0.001&&a.y<b.y)) return 1;
    else return 0;
}

int main()
{
    int n,i,j;
    double d,e;
    for (i=1;i<=n;i++)
    {
        fscanf(f,"%lf%lf",v[i].x,v[i].y);
    }
    for (i=1;i<n;i++)
        for (j=i+1;j<=n;j++)
        {
            d=(v[i].x-v[j].x)*(v[i].x-v[j].x)+(v[i].y-v[j].y)*(v[i].y-v[j].y);
            e=(v[i].x+v[j].x)/2-(v[i].y+v[j].y)/2;
            c=v[j].x*v[j].x+v[j].y*v[j].y-d;
            b=-2*v[j].x*e-2*
        }
    return 0;
}