from math import *
eps = 1e-10
for i in range(int(input())):
    input()
    pos = [tuple(map(float, input().split())) for i in range(6)]
    for p in pos:
        (x, y) = p
        if x==0: continue
        d = degrees(atan(y/x))
        if(d<=eps+50 and d>=-eps):
            print("%.12f" % d)
            break