#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
     int t,n,x,y;
    scanf("%d",&t);
    for(int i=0;i<t;i++)
        {
        scanf("%d",&n);
        int l=-1,u=-1,l1=-1,u1=-1,d,f=-1;
        for(int j=0;j<n;j++)
            {
            scanf("%d%d",&x,&y);
            if(l==-1 && u==-1)
            {
                l=x;
                u=y;
                continue;
            }
            if(l1==-1 && u1==-1)
                {
                l1=x;
                u1=y;
                d=sqrt((pow((l-l1),2)+pow((u-u1),2)));
                continue;
            }
            if(x==0)
                {
                if(y==d)
                    continue;
                else
                    {
                    printf("NO");
                    f=0;
                    break;
                }
            }
            else if(y==0)
                {
                 if(x==d)
                    continue;
                else
                    {
                    printf("NO");
                    f=0;
                    break;
                }

            }
            else if(x!=0 && y!=0)
                {
                if(x==d || y==d)
                    continue;
                else
                    {
                    printf("\nNO");
                    f=0;
                    break;
                }
            }
                
        }
        if(f!=0)
            {
            printf("YES");
        }
         
    }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}