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-> skala podobieństwa k = obwód A'B'C' : obwód ABC = 27 : 9 = 3
-> A'B' = k * AB = 3 * 2 = 6cm
-> B'C' = k * BC = 3* 3 = 9cm
-> C'A' = k * CA = 3 * 4 = 12cm