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Pc=2Pp+Pb
Pp = 5*12/2= 30 cm²
H = 10 cm
V = Pp*h = 30 cm² * 10 cm = 300 cm³
Pb = (5 cm+12 cm+13 cm)* 10 cm = 300 cm²
Pc = 2Pp + Pb = 60 cm² + 300 cm² = 360 cm²