How to calculate the surface area of cylindrical double-layer cake

Large cylinder bottom area+large cylinder lateral area+small cylinder lateral area+small cylinder bottom area.

Lateral area of cylinder = bottom circumference × height, that is, S side = 2πRH；; The bottom area of a cylinder = the area of a circle, that is, the bottom of S = π r.

The bottom surfaces of cylinders are all round and have the same size. The vertical distance between two sides of a cylinder is called height. Open the side of the cylinder and get a rectangle. One side of this rectangle is the circumference of the bottom of the cylinder.