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


int main() {
    int q;
    cin>>q;
    while(q--){ int z=0;
               int n;cin>>n;int x[n],y[n];long ans[n]={0};
        for(int i=0;i<n;i++)
            cin>>x[i]>>y[i]; ans[1]=(x[1]-x[0])*(x[1]-x[0])+(y[1]-y[0])*(y[1]-y[0]);ans[0]=ans[1];
        for(int i=2;i<n;i++)
            { ans[i]=(x[i]-x[0])*(x[i]-x[0])+(y[i]-y[0])*(y[i]-y[0]);
            }
        for(int i=2;i<n;i++){ 
            if(ans[i]!=ans[0]){
                cout<<"NO"<<endl;z=1;break;}
        }
               
          if(z==0) 
        cout<<"YES"<<endl;
    }
    return 0;
}