#yuki_105
import math

eps=1.0e-10
t=int(raw_input())
sin50=math.sin(100.0*math.pi/360)
cos50=math.cos(100.0*math.pi/360)
for i in xrange(t):
 dummy=raw_input()
 for j in xrange(6):
  a,b=map(float,raw_input().split())
  if cos50<=a and a<=1.0+eps and 0.0-eps<=b and b<=sin50:
   res=360.0*math.atan(b/a)/(2*math.pi)
   if res<eps:
    print "%.7f" % 0.0
   else:
    print "%.7f" % res