a) 4 dm= 40 cm
2 mm=0,2 cm
V= 5•40•0,2=40 cm3
Pc=(40•0,2+5•0,2+5•40)•2= (8+1+200)•2 = 209•2 = 418 cm2
b) V= 1,1•1,1•1,1=1,21•1,1=1,331 cm3
Pc= (1,1•1,1)•6= 1,21•6=7,26 cm2
