class Quadrilateral
  # def initialize(side1,side2,side3,side4)
  #   @side1 = side1
  #   @side2 = side2
  #   @side3 = side3
  #   @side4 = side4
  # end
end

  class Equalateral < Quadrilateral
    def initialize(side1)
    @side1 = side1
    end
    def area
      @side1 * @side1
    end

    def single_side
      @side1
    end

    def perimeter
    @side1 *4
    end
  end



class Rectangle < Quadrilateral
  def initialize(side_width, side_length)
  @side_width = side_width
  @side_length = side_length
  end

  def area
   @side_width *  @side_length
  end

  def perimeter
    (@side_width*2) + (@side_length*2)
  end
end

class Square < Equalateral
end

class Rhombus < Equalateral
end

class Trapezoid < Quadrilateral
  def initialize(side1, side2, side3, side4)
  @side1 = side1
  @side2 = side2
  @side3 = side3
  @side4 = side4
  end

  def perimeter
    @side1 + @side2 + @side3 + @side4
  end
end




def test
    squa = Square.new(1)
    recta = Rectangle.new(2,4)
    rhom = Rhombus.new(4)
    trape = Trapezoid.new(1,2,2,4)
    puts squa.area
    puts squa.perimeter
    puts squa.single_side
    puts recta.perimeter
    puts recta.area
    puts rhom.perimeter
    puts rhom.single_side
    puts trape.perimeter
end

test