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AB^2 = 6,5^2 - 2,5^2
AB^2 = 42,25 - 6,25
AB=6
-> obwód ABC = 6 + 2,5 + 6,5 = 15
trójkąty ABC i EDF są podobne -> skala podobieństwa k = FD/CB = 3/ 2,5 = 6/5
obwód EDF =k* obwód ABC = 6/5 * 15 = 18