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Defining a Virtual Attribute
CodeExpectedActual
class Arc
  attr_accessor :radians
  def degrees
    @radians * 180 / Math::PI
  end
  def degrees=(degrees)
    @radians = degrees * Math::PI / 180
  end
end
arc = Arc.new
arc.degrees = 180
arc.radians
 3.14159265358979 3.14159265358979 
arc.radians = Math::PI / 2
arc.degrees
 90.0 90.0