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v= 1280cm3
dit= lp?
V= La.t
1280cm3= S2.t
1280cm3= (16cm)2. t
1280cm3= 256cm2.t
t= 1280cm3 : 256cm2
= 5cm
lp= La+ Ls
= 256cm2 + 4.(16cm). 5cm
= 256 cm2+ 64cm.5cm
= 256cm2+ 320cm2
= 576cm2