#include "bits/stdc++.h"
using namespace std;

#define MAX 2000002

int dp[MAX];

int main(){
	int T;
	cin >> T;
	for (int t = 0; t < T; t++)
	{
		vector<double> X(6), Y(6);
		for (int i = 0; i < 6; i++)
		{
			cin >> X[i] >> Y[i];
		}

		double ans = atan2(Y[0], X[0]) / 3.141592653589793238462 * 180;
		ans += 360;
		while (ans > 55) ans -= 60;
		printf("%.14f\n", ans);
	}
}