bob wants to know how much carpet he should use his room is 4 feet by 2 feet how many SQUARE feet of carpet does bob need.
4 X 2 = 8 ft2
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a surface that does not move
It would help if the question was less obscure. What do you mean by "work"? How the surface area affects chemical processes (for example the surface area of catalysts), or diffusion, or surface areas and friction?
For example, the amount of nutrients a cell can absorb are proportional to its surface area.
It depends, but in let's look at a simple example to help you see how. How would you find the surface area of a cube. Find the surface area of one of the faces and since there are six of those, multiply it by 6. For example, a 2x2x2 cube. Each face has a surface area of 4 and there are 6 of them so the total surface area is 24 units. We do the same thing with other 3d objects, but it may be harder to find the surface area of faces. In face, sometimes there are no faces and we may need calculus to find the surface area.
Increasing the Surface Area increases the heat loss. You will find a nice example in the related question link below.