import sys
import math

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LF(): return list(map(float, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    n=int(input())
    for _ in range(n):
        input()
        xy=[LF() for _ in range(6)]
        for x,y in xy:
            deg=math.degrees(math.atan2(y,x))
            #print(deg)
            if -0.000001<=deg<51:
                print(format(deg,".7f"))
                break
        #print()

main()