ruby circle

circle.rb

class Circle

  # attr_accessor :radius

  def initialize(radius)
    @radius = radius.to_i
  end

  def diameter
    @diameter = @radius * 2
  end

  def circumference
    @circumference = @diameter * Math::PI
  end

  def area
    @area = Math::PI * @radius * @radius
  end
end

round_thing = Circle.new(3)
puts round_thing

puts round_thing.diameter
puts round_thing.circumference
puts round_thing.area

#diameter = radius *2

#circumference = diameter * pi

#area = pi * radius * radius