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The answer will depend on what the surface area is of. The surface areas of regular shapes are can be calculated from formulae but these will depend on the shapes. For non-regular areas there may or may not be simple formulae.
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.
The surface area is the sum of all the areas of all the shapes that cover the surface of the object.
It would be the sum of the areas of each surface separately.
The ratio of their surface areas is 42 to 52 or 16 to 25