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P=2*8*5+2*8*12+2*5*12=80+192+120=392cm²
b)
P=2*3√2*4√2+2*3√2*5√2+2*4√2*5√2=48+60+64=172cm²
P=2ab+2bc+2ac
P=2*40+2*60+2*96=80+120+192=392 cm²
b)3√2cm X 4√2cm X 5√2cm
P=2*24+2*40+2*30=48+80+60=188 cm²