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Pc=2Pp + Pb
Pp= 3dm x 4dm = 12dm
Pb = 2x4dmx5dm+2x3dmx5dm = 2x20dm + 2x15dm = 40dm + 30dm = 70dm
Pc = 2x12dm + 70dm = 24dm + 70dm = 94dm
V=Ppxh
Pp = 12dm
h = 5dm
V = 12dmx5dm = 60dm