#include<iostream>

#include<stdio.h>

#include<cstring>

#include<algorithm>

#include<cmath>

using namespace std;

double a,b,c,d,e,f;

double mix( double x,double y,double xx,double yy ){return x*yy - xx*y;}

int main( )

{

    int N,T; scanf("%d",&T);

    while( T-- )

    {

        scanf("%d",&N);  scanf("%lf%lf%lf%lf",&a,&b,&c,&d);

        double sumx = ,sumy = ,suma = ;

        for( int i = ; i <= N; i++ )

        {

            scanf("%lf%lf",&e,&f);

            double area = mix(e-a,f-b,c-a,d-b)/2.0;

            sumx += (( a+c+e )*area);

            sumy += (( b+d+f )*area);

            suma += area;

            c = e; d = f;

        }

        sumx = int(sumx/suma/3.0*100000.0);

        sumy = int(sumy/suma/3.0*100000.0);

        printf("%.2lf %.2lf\n",sumx/100000.0,sumy/100000.0);

    }

    return ;

}