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You need to know the lengths of a few sides, but check out the link for clear calculations.
You need the surface area of then ends and those are circles so Pixr2 and there are 2 of them. Now you see the sides and that is 2Pirxh. Add these together and you have the surface area of the cylinder. Surface Area of a Cylinder = 2 pi r2 + 2 pi r h
Faces are sides but sides (as in sides of a square) need not be faces.
Three or more sides, no round sides, and it has to be a closed shape.
You have to visualize the 3-D object. Think in your mind that this object has six sides. To find the surface area you need to add all of the areas of these sides together. In order to do that you need this formula... S.A. = 2(L*H) + 2(L*W) + 2(H*W) L=length H=height W=width Go to the related link below for a good representation