#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <ctype.h>

#include <math.h>

#include <stack>

#include <queue>

#include <iostream>

#include <string>

#include <algorithm>

#define eps 1e-9

using namespace std;

int tg, n;

int x[1000], y[1000];

double calc(double d)

{

	int i, j;

	double dis1,dis2,dis;

	dis=0.0;

	for(i=1; i<n; i++)

	{

		for(j=i+1; j<=n; j++)

		{

			dis1=fabs( cos(d)*(y[i]-y[j])-sin(d)*(x[i]-x[j]) );

			dis2=fabs( sin(d)*(y[i]-y[j])+cos(d)*(x[i]-x[j]) );

			if(dis < dis1 ) dis = dis1;

			if(dis < dis2 ) dis = dis2;

		}

	}

	return (dis*dis);

}

int main()

{

    double ll, rr, mid, midmid;

	double s1, s2;

	cin>>tg;

	while(tg--)

	{

		cin>>n;

		for(int i=1; i<=n; i++){

			cin>>x[i]>>y[i];

		}

		ll=0.0; rr=acos(-1.0); //rr=180.0 确定好区间

		while( rr-ll>=eps )

		{

			mid = (ll+rr)/2; midmid=(rr+mid)/2;

			s1=calc(mid);

			s2=calc(midmid);

			if(s1<s2){

				rr=midmid;

			}else

			{

				ll=mid;

			}

		}

		printf("%0.2lf\n", s1<s2?s1:s2);

	}

    return 0;

}