Each small cube has a volume of 1 cm 3. The volume of the cuboid is 12 cm 3. The surface area of a 3D shape is the total area of all the faces. A cube has six faces which are all squares.

The opposite faces of a cuboid are the same sized rectangles, so find the total area of the three different faces, then double to find the total surface area. The area of the three faces is \(12 ...