#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int fnd(int a, int b, int c, int d)
{
    int res = sqrt(abs(((c-a)*(c-a)) + ((d-b)*(d-b))));
    //cout<<c<<a<<d<<b<<endl;
    return res;
}
int main() {
    int x,y,x1,y1,x2,y2, sum, n, t;
    cin>>t;
    while(t--)
    {
        int flag = 0;
        cin>>n;
        cin>>x>>y;
        cin>>x1>>y1;
        int ans = fnd(x,y,x1,y1);
        //cout<<ans<<endl;
        int m = (n-2);
        while(m--)
        {
            cin>>x2>>y2;
            sum = fnd(x,y,x2,y2);
            //cout<<sum<<" ";
            if(sum != ans)
            {
                flag = 1;
                break;
            }
        }
        if(flag == 0)
        {
            cout<<"YES"<<endl;
        }
        else
        {
            cout<<"NO"<<endl;
        }

    }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}