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h AB = 3,6 cm
pole P = a * h AB = 5 cm * 3,6 cm = 18 cm kw.
b = x cm
h BC = 3 cm
obliczam b:
P = b * h BC
b * 3 = 18 cm kw.
3b = 18
b = 6 cm
obliczam obwód: 2a + 2b = 2* 5 + 2* 6 = 10 + 12 = 22 cm