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4 cm * 6 cm = 24 cm^2, 24 cm^2 * 2 = 48 cm^2
5 cm * 6 cm = 30 cm^2, 30 cm^2 * 2 = 60 cm^2
(teraz wszystko dodajemy)
40 cm^2 + 48 cm^2 + 60 cm^2 = 148 cm^2