What is the surface area of a cube with 3 on each side in square millimeters?

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