class A
  def initialize
    t = gets.chomp.to_i

    t.times do
      str = gets.chomp

      6.times do
        x, y = gets.chomp.split(' ').map(&:to_f)
        arc = Math.atan(y/x) * 180 / Math::PI

        if x > 0 && y > 0 && arc.between?(0,50)
          puts arc
        end
      end
    end
  end
end

A.new