#include <algorithm>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <vector>
using namespace std;
typedef long long int ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
#define rep(i,x) for(int i=0;i<(int)(x);++i)

int main(){
	int n;
	double x, y, eps = 0.000001;
	string s;
	cin >> n;
	rep(i,n) {
		getline(cin,s);
		double tmp, min = -1;
		rep(i,6) {
			cin >> x >> y;
			tmp = atan2(y, x)*180/M_PI;
			if (0-eps<=tmp && tmp+eps<50 && (min<0 || tmp < min)) min = tmp;
		}
		printf("%.12lf\n", min);
	}
	return 0;
}