| There are multiply different equations. Each Geometric figure has it's own equation. Basically, you do what it tells you. You find the area of the surface using equations for 2-D figures. For example, something easy: a box. To find the surface area, find the area of each side and add them together. Since opposite sides are the same, you can use this formula:
(H*L*2)+(L*W*2)+(W*H*2)= Surface area, where W= width, L= length, and H=height
You multiply these variables together to get the area of the box's faces. The multiplication of 2 within each set of parentheses represents the opposite side of the box, so you can do 2 sides at once.
Now try a real example. A box has dimensions of 3*4*5. What is its surface area?
3*4=12 (one side) 12*2=24 (this represents the first side and the side opposite of it.
4*5=20 20*2=40
5*3=15 15*2=30
Now add up the areas.
24+30+40=94, so the surface area is 94.
Did you get all of that? If you didn't, just tell me and I'll repeat myself. | 
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