import numpy as np

N = int(input())
for _ in range(N):
    input()
    B = np.array([tuple(map(float, input().split())) for _ in range(6)])
    X = np.rad2deg(np.arctan2(B[:, 1], B[:, 0])) % 60
    if X[X > 50].any():
        print(0)
        continue
    print(X.mean())