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bok 2 = 1,2 - 0,25 = 0,95m
bok3 = 3/4 * 1,2 = 0,75 * 1,2 = 0,9
długosc trójkąta = 1,2 + 0,95 + 0,9 = 3,05 metrów czyli 3 metry i 5 centymetrów.
II bok - 1.2 - 0.25 = 0.95
III bok - 1.2 * 3/4 = 0.9
daj naj;)