How Do I Find The Surface Area Of A Rectangular Prim, And Of A Cylinder?

The surface area is the sum of all areas of all the shapes which cover the surface of an object.
The Surface Area of a Rectangular Prism = 2ab + 2bc + 2ac
a, b, and c are lengths of 3 sides.
And the Surface Area of Cylinder = 2 pi r 2 + 2 pi r h
where h is the height of cylinder, r is radius of the top