import java.util.Scanner;


public class Main_yukicoder105 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int t = sc.nextInt();
        for (int tcase = 0; tcase < t; tcase++) {
        	double ret = 0;
        	for (int i = 0; i < 6; i++) {
        		double x = sc.nextDouble();
        		double y = sc.nextDouble();

        		double tmp = Math.atan2(y, x) / Math.PI * 180;

        		if (tmp >= 0 && tmp <= 50) {
        			ret = tmp;
        		}
        	}

        	System.out.printf("%.7f\n", ret);
        }

        sc.close();
    }
}