If X is my site, and my site has a population of 'P' (say P=500) and the polygons represent land that can 'grow food' and I know that I a population of P needs 'A' sq km of this land, what is the radius of the circle going to be? (A in this case is say 5.83 sq km). The polygons belong to four different classes (agr, fruit, olive, nut).





I think the generic form will be:
Area ( SymDifference ( SymDifference ( Land , Circle ) , GeomUnion ( Land , Circle) ))


(thx fbolduc!)

But I am getting lost as to how to fill in the details... help???!!?? :S