import sys
from math import acos, pi

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def lcm(a, b):
    return a * b // gcd(a, b)

def solve():
    T = int(input())
    eps = 10**(-12)

    for i in range(T):
        input()
        xt = -1

        for j in range(6):
            x, y = map(float, input().split())

            if y >= -eps and x >= -eps:
                xt = max(x, xt)

        if abs(xt - 1) <= eps:
            xt = 1.0
        elif abs(xt) <= eps:
            xt = 0.0

        ans = acos(xt) / pi * 180.0

        print(ans)



if __name__ == '__main__':
    solve()