from math import *

T = int(input())
eps = 1e-12

rad_to_deg = lambda rad: rad * 180 / pi + 180

for _ in range(T):
    input()
    x, y = [float(i) for i in input().split()]
    x = round(x,12)
    y = round(y,12)
    rad = atan2(y, x)
    deg = rad_to_deg(rad)
    deg = round(deg, 12)
    while deg > 50:
        deg -= 60
    print(deg)
    for _ in range(5):
        input()