Ruby on Rails

wondering if there is a way to do this..

say we have a model that has attributes length and width..

:length and :width

and we have a class square:

class Square < ActiveRecord::Base

 def area
   area = length * width
 end

end

is there a way i can do a:

Square.find(:area => '144')

to produce any squares with an area of 144?

i know there are lots of other ways to do this, but in the case i am
working on, a find would be REALLY clean..

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