#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
#include <iomanip>
using namespace std;
const double pie=3.14159265358979265358979;
int main(){
  int T;
  cin>>T;
  for(int i=0; i<T; ++i){
    double X1=0,Y1=0,X2=0,Y2=0;
    double XL=1;
    XL/=2;
    XL+=1e-9;
    for(int j=0; j<6; ++j){
      cin>>X1>>Y1;
      if(XL<X1){
        X2=X1;
        Y2=Y1;
      }
    }
    double t=Y2;
    t/=X2;
    double deg=atan(t);
    deg*=180;
    deg/=pie;
    if(deg<0) deg=0;
    cout<<fixed<<setprecision(9)<<deg<<endl;
  }
  return 0;
}