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Strpaj me u koordinatni | Plane And Simple #4

Dane su točke (1,3), (-3,5), (-5,-3) i (7,-1). Neke dvije točke spojili smo jednom dužinom, a preostale dvije drugom dužinom. Neka je d udaljenost polovišta tih dviju dužina. Odredite najveću moguću vrijednost od d.
Points (1, 3), (-3, 5), (-5, -3) and (7, -1) are given. Two of them are end points of a line segment, while the other two are the end points of another line segment. Let d be the distance between the midpoints of those two segments. What is the greatest possible value of d?