Review of someone else's code

rectangle_review.rb

class Rectangle
  attr_accessor :width, :height
 
  def initialize(width, height)
    @width  = width
    @height = height
  end
 
  def ==(other)
    (other.width  == self.width && other.height == self.height ) ||
    (other.height == self.width && other.width  == self.height )
  end
end 
  
  def rectangle_area(ar)
    area = []
    ar.each do 
      area << self.(width * height)
    end
    area
  end
 
  def rectangle_perimeter(pm)
    perim = []
    pm.each do
      perim << self.((width * 2) + (height * 2))
    end
    perim
  end
 
  def rectangle_diagonal(dg)
    diag = []
    dg.each.to_f do
      diag << self.(Math.sqrt(@width**2 + @height**2))
    end
    diag
  end
 
 def rectangle_square(sq)
    squr = []
    sq.each do
      if width == height
        return true
      else
        return false
     end
    squr
  end
end