Each flat surface is a face
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You need to find the area of each two dimensional surface on the figure. Do you have a specific figure in mind?
False. You must find the area of each of the faces, then add those together.
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It is the area of the exposed surface. So if you take a cube, the surface area is the sum of the areas of each of the 6 faces. They are all the same in the case of a cube. In general, add up the surface area of each exposed surface and this is the total surface area.