Total surface are is the sum of the areas of all the sides of a three-dimensional object.
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That is the definition of the surface area!
The surface area is the sum of all the areas of all the shapes that cover the surface of the object.
A curved surface area can be described as one where the gradient of the normal to the surface changes smoothly from point to point.
Lateral Area is the area of the sides of a solid, not including base.
(surface area of cube 1 or 2 (either)) times 2 = (total surface area of two identical cubes)