You times when doing area. You add when finding permiter.
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to find the surface area you have to first find the area of each part then add the areas together.
You will need to find the surface area of each face and add them together.
You find the surface area of each of its six faces and add them together.
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
If you know how to find the area of all the shapes of the faces of the net, add the area of them together to get the surface area.