import math

def str2float(x):
    thresh = 14
    if x[0] == "-":
        thresh += 1
    xs = x[0:thresh]
    if set(xs.replace("-","").replace(".","")) == set("0"):
        return 0.0
    else:
        return float(xs)

def solver():
    x0 = 0
    y0 = 0
    for i in range(6):
        x, y = map(str2float, input().split(" "))
        if (x > 0 and y >= 0) and (x > x0):
            x0 = x
            y0 = y
            if y == 0.0:
                x0 = 1.0
    return math.acos(x0)*180.0/math.pi

T = int(input())
ans = []
for i in range(T):
    input()
    ans.append(solver())

for i in ans:
    print(i)