lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end

read_line.to_i.times do
  read_line
  xy = (1..6).map { read_line.split.map(&.to_f) }
  printf "%.12f\n", xy.map { |i|
    Math.atan2(i[1], i[0]) * 180 / Math::PI
  }.select { |d|
    -1e-10 <= d < 50 + 1e-10
  }.[0]
end