#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
 
const double pi = acos(-1);
const double upper = 55 * pi / 180;
const double lower = -5 * pi / 180;
 
int main(){
	int T;
	cin >> T;
 
	for(int i=0;i<T;i++){
		double res = 0;
		for(int j=0;j<6;j++){
			double x, y;
			cin >> x >> y;
 
			double theta = atan2(y, x);
			if(lower < theta && theta < upper){
				res = theta;
			}
		}
		printf("%.15f\n", res * 180 / pi);
	}
 
	return 0;
}