import math

N = int(input())
for i in range(N):
    input()
    flag = True
    for _ in range(6):
        x, y = map(float, input().split())
        if flag \
                and 1 / 2 - 10 ** -12 < x <= 1 + 10 ** -12 \
                and - 10 ** -12 <= y < math.sin(math.pi / 3) + 10 ** -12:
            ans = (math.asin(y) * 180 / math.pi)
            print(f'{ans if ans < 60 - 10 ** (-12) else 0 :.8f}')
            flag = False