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3/EF=5,4/7,2
FE=4
DE= 2*FE = 8
(TA LINIA / TO KRESKA UŁAMKOWA)
7,2 DO KWADRATU + 5,4 DO KWADRATU = AC DO KWADRATU
AC DO KWADRATU = 81 / PIERWIASTEK
AC = 9