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4*40+4*75+4*45=160+300+180=640cm
Pole powierzchni całkowitej
P=2Pp+Pb
Pp=75*40=3000cm2
Pb=2(75*45)+2(40*45)=2*3375+2*1800=6750+3600=10350cm2
Pc=2*3375+10350=6750+10350=17100cm2(ilość siatki)
P = 2 x 1600 + 4 x 2025
P = 3200 + 8100
P = 11300 cm³