def solve():
    for _ in range(6):
        a,b = map(float,input().split())
        if 0.01 < a < 0.99 and 0.01 < b < 0.99:
            x = acos(a)*180.0/pi
            if x >= 52.0: x -= 60.0
    return x
        
from math import acos,pi
n = int(input())
for i in range(n):
    input()
    print(solve())