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V = 40cm³
P 1 ściany bocznej = 10cm²
V = 1/3 * Pp * H
Pp = V/ (1/3 * H)
Pp = 40/4
Pp = 10cm²
Pc = 6*Pśc.b. + Pp
Pc = 6 * 10cm² + 10cm² = 70cm²