#include<iostream>
#include<vector>
#include<math.h>
#include<algorithm>
using namespace std;
using ll = long long;

void solve(){
  long double theta=1e9, eps=1e-13;
  for(int i=0; i<6; i++){
    long double x, y; cin >> x >> y;
    if(x<eps||y<eps) continue;
    theta=min(theta, atan2(y, x));
  }
  long double ans=theta*45.0/atan2(1, 1);
  if(ans>=60.0-eps) ans=0;
  printf("%.10lf\n", ans);
}

int main(void){
  int t; cin >> t;
  while(t--) solve();
  return 0; 
}