Classes: Shapes

class Shape
  attr_accessor :color
  
  def initialize(color = nil)
    @color = color || 'Red'
  end 
  
  def larger_than?(other)
    self.area > other.area
  end
end

class Rectangle < Shape
  attr_accessor :width, :height
  
  def initialize(width, height, color = nil)
      @width, @height = width, height
      super(color)
  end
  
  def area
    width * height
  end
end

class Square < Rectangle
  
  
  def initialize(side, color = nil)
    super(side, side, color) 
  end
end

class Circle < Shape
  attr_accessor :radius
  def initialize(radius, color = nil)
    @radius = radius
    super(color) 
  end
  
  def area
    Math::PI * (radius * radius)
  end
end

c = Circle.new(7, "Brown")

c2 = Circle.new(8)

p c.respond_to?('color') #why is this false?
p c.color
p c.larger_than?(c2)
p c.area
p c2.area