#include<iostream>
using namespace std;
int main()
{
    int q;
    cin>>q;
    int i;
    for(i=0;i<q;i++)
    {
        int n;
        cin>>n;
        int a[10][2];
        int j;
        for(j=0;j<n;j++)
        {
            cin>>a[j][0]>>a[j][1];
        }
        for(j=1;j<n-1;j++)
        {
            if(a[j][0]*a[j][0]+a[j][1]*a[j][1]==a[j+1][0]*a[j+1][0]+a[j+1][1]*a[j+1][1])
                continue;
            else
            {
                cout<<"NO"<<endl;
                break;
            }
        }
        if(j==n-1)
        {
            cout<<"YES"<<endl;
        }

    }
    return 0;
}