Since this net describes a cube, we know that all sides of a cube are equal so if we know one side that is 3, the other side will be 3. Then we multiply 3 and 3 to get 9 for one face. But since a cube has 6 faces, we multiply the result by 6, so 9 * 6 = 54 suare inches.
To find the surface area, you multiply the width by the length of one of the squares, then multiply that number by the number of squares in the diagram.
