/* -*- coding: utf-8 -*-
 *
 * 3180.cc:  No.3180 angles sum - yukicoder
 */

#include<cstdio>
#include<cmath>
#include<algorithm>

using namespace std;

/* constant */

const double DELTA = 1e-9;

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    double ax, ay, bx, by, cx, cy;
    scanf("%lf%lf%lf%lf%lf%lf", &ax, &ay, &bx, &by, &cx, &cy);

    double tha = atan2(ay, ax);
    double thb = atan2(by, bx);
    double thc = atan2(cy, cx);
    double d = abs(tha + thb - thc);
    //printf(" a+b=%.12lf, c=%.12lf, d=%.12lf\n", tha + thb, thc, d);

    if (abs(tha + thb - thc) < DELTA) puts("Yes");
    else puts("No");
  }

  return 0;
}