import java.util.Scanner;

public class Yukicoder105 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double x, y, bx, by, tMax, tMin, theta = 0;
		int t = sc.nextInt();
		for (int i = 0; i < t; i++) {
			x = y = 0;
			for (int j = 0; j < 6; j++) {
				bx = sc.nextDouble() + 1e-12;
				by = sc.nextDouble() + 1e-12;
				if (bx > x && by >= 0) {
					x = bx;
					y = by;
				}
			}
			tMax = 50;
			tMin = 0;
			for (int j = 0; j < 100; j++) {
				theta = (tMax + tMin) / 2.0;
				bx = Math.cos(Math.toRadians(theta));
				if (bx < x) tMax = theta;
				else tMin = theta;
			}
			System.out.println(theta);
		}

	}

}