#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int T; cin >> T;
    while(T--){
        vector<pair<long long,long long>> P(3);
        vector<long long> A;
        for(auto &[x,y] : P) cin >> x >> y,A.push_back(x),A.push_back(y);

        long long now = A.at(1)*A.at(2)*A.at(4)+A.at(0)*A.at(3)*A.at(4)-A.at(0)*A.at(2)*A.at(5)+A.at(1)*A.at(3)*A.at(5);
        vector<long double> An(3);
        for(int i=0; i<3; i++){
            auto [x,y] = P.at(i);
            An.at(i) = atan2l(y,x);
        }
        bool yes = abs(An.at(0)+An.at(1)-An.at(2)) <= 1e-9;
        if(now == 0 && yes) cout << "Yes\n";
        else cout << "No\n";

    }

}