Respuesta :

apologiabiology
ok so surface area
cube has 6 faces
each face is a square
so
surfac area=6 times (area of a square)
area of a square=side times side=side^2
side=3
therefore we have
SA=6(3^2)
SA=6(9)
SA=54

assuming that the side is 3mm
54mm^2 is surface area