#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 n,x,y,x1,y1,d=1,d1=2,count=0,flag=0,q;
    cin>>q;
    for(int j=0;j<q;j++)
        {
    cin>>n;
    for(int i=0;i<n;i++)
        {if(d1==d)
            count++;
        /* else
             {
             flag=1;
             break;
         }*/
        cin>>x>>y;
         
        if(i>=1)
            {
       
           d=sqrt(pow((x-x1),2)+pow((y-y1),2));
            //cout<<d;
            
        }
        d1=d;
        x1=x;
            y1=y;
        
        }
    /*if(flag==1)
        cout<<"NO";*/
     if(count==n-1)
        cout<<"YES\n";
    else cout<<"NO\n";
    //cout<<count;
    }
    return 0;
}