One more time. If the ferret has a 25 meter rope attached to the midpoint of one wall of a 10 by 10 meter building, how much area does he have to roam if you do not count the overlap twice?

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You need to find the area of the roaming area,namely A=pi*25^2=625pi, then subract the area of the building10*10= 100sq.meters,i.e. (625pi - 100) sq. meters should be the answer.