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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int q,n,i;
    cin>>q;
    while(q--)
    {
        cin>>n;
        int x[n],y[n];
        for(i=0;i<n;i++)
        {
            cin>>x[i]>>y[i];
        }
        int s1=0,s2=0;
        for(i=0;i<n;i++)
        {
            s1=sqrt(pow((abs(x[i]-x[i+1])),2)+pow((abs(y[i]-y[i+1])),2));
            if(i==0)
                s2=s1;
            if(i!=0&&s2!=s1)
                break;
        }
        
        if(i!=n)
            cout<<"NO\n";
        else
            cout<<"YES\n";
    }
    return 0;
}