How do I output a superscript 2 from a helper in Rails 3.2?

1. "30 Meters " + raw("²")
2.        
3. def area_conversion(feet, project)
4.     if project.metric
5.       "#{(feet * 0.0929).round} Meters" + raw("²")
6.     else
7.       "#{feet} sq. ft. "
8.     end
9.   end
10.        
11. def area_conversion(feet, project)
12.     if project.metric
13.       "#{(feet * 0.0929).round} Meters" + "²".html_safe
14.     else
15.       "#{feet} sq. ft. "
16.     end
17.   end
18.        
19. "#{(feet * 0.0929).round} Meters²".html_safe