import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) 
    {
        Scanner sc=new Scanner(System.in);
        int q=sc.nextInt();
        for(int i=1;i<=q;i++)
        {
            int n=sc.nextInt();
            int x[]=new int[10000];
            int y[]=new int[10000];
            for(int j=1;j<=n;j++)
            {
                x[j]=sc.nextInt();
                y[j]=sc.nextInt();
                
            }
            double s[]=new double[10000];
            for(int k=1;k<=n;k++)
            {
                if(k<n)
                    s[k]=Math.sqrt(Math.pow((y[k+1]-y[k]),2)+Math.pow((x[k+1]-x[k]),2));
                else
                    s[k]=Math.sqrt(Math.pow((y[0]-y[k]),2)+Math.pow((x[0]-x[k]),2));
            }
            if(n==4)
            {
                int flag=0,c;
                for(int j=1;j<=n;j++)
                {
                    c=0;
                    for(int k=1;k<=n;k++)
                        {
                        if(s[j]==s[k])
                            c++;
                    }
                    if(c==2)
                        flag=1;
                    else
                        {
                        flag=0;
                        break;
                    }
                }
                if(flag==1)
                    System.out.println("YES");
                else
                    System.out.println("NO");
            }
            else if(n==3)
            {
                int flag=0;
                for(int j=1;j<=n;j++)
                {
                    int c=0;
                    for(int k=1;k<=n;k++)
                        {
                        if(s[j]==s[k])
                            c++;
                    }
                    if(c==2)
                        flag=1;
                    else
                        flag=0;
                      
                }
                if(flag==1)
                    System.out.println("YES");
                else
                    System.out.println("NO");
            }
            else
               System.out.println("YES"); 
        }
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}