The surface area formula of the cuboid is: S=2 * (ab+bc+ca).
Since the area of the two opposite faces is equal, first calculate the upper and lower faces, then calculate the front and rear faces, and finally calculate the left and right faces.
It is composed of six faces, the area of opposite faces is equal, and two faces may be square.
A cuboid is a straight four prism with a rectangular bottom (or a straight parallelepiped with a rectangular top and bottom).