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P2 = 3x1 = 3cm^2
P3= 3x2 = 6cm^2
2 ściany po 2 cm^2 to 4 cm^2
2 ściany po 3 cm^2 to 6cm^2
2 ściany po 6cm^2 to 12 cm^2
Razem (...) wynosi 22 cm^2