#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

const double PI = acos(-1);
const double EPS = 1e-3;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int T;
  cin >> T;
  while (T--) {
    double ret;
    REP (i, 6) {
      double x, y;
      cin >> x >> y;
      double theta = atan2(y, x);
      double tmp = 180 * theta / PI;
      if (0-EPS <= tmp  && tmp <= 50+EPS)
        ret = tmp;
    }
    cout << fixed << setprecision(12) << ret << endl;
  }
  
  return 0;
}