package yukicoder;
import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		for(int time=0;time<t;time++){
			double[] x=new double[6];
			double[] y=new double[6];
			double x1=-1;
			double y1=100;
			for(int i=0;i<6;i++){
				x[i]=sc.nextDouble();
				y[i]=sc.nextDouble();
				double deg=Math.asin(y[i])*360.0*(1/(2.0*Math.PI));
				if((0<=deg&&deg<54)||(180>=deg&&deg>=176)){
					y1=y[i];
					x1=x[i];
				}
			}
			System.out.println(360.0*Math.asin(y1)*(1/(2.0*Math.PI)));
		}
	}
}