/* -*- coding: utf-8 -*-
 *
 * 105.cc: No.105 arcの六角ボルト - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const double PI = acos(-1.0);
const double MIN_TH = 0.0;
const double MAX_TH = 50.0 * PI / 180;

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  //printf("MIN_TH=%lf, MAX_TH=%lf\n", MIN_TH, MAX_TH);
  
  int tn;
  cin >> tn;

  while (tn--) {
    double ans;
    for (int i = 0; i < 6; i++) {
      double x, y;
      cin >> x >> y;
      double th = atan2(y, x);
      if (MIN_TH <= th && th < MAX_TH) {
	//printf("%d: (%lf,%lf)=%lf\n", i, x, y, th);
	ans = th * 180 / PI;
      }
    }

    printf("%.12lf\n", ans);
  }

  return 0;
}