Definition of "surface area" []

• The total area on the surface of a three-dimensional figure. (noun)

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• "The surface area of a sphere is proportional to the square of the radius ESK."
• "Though the simple surface area of the brain is about a twentieth of a square meter, the folding brings its effective surface area to 1.5 square meters, a thirtyfold increase in brain power with no increase in head size."
• "Individual leaves have also evolved to present as much surface area as possible to the heavens, so a single big tree, with its foliage running into the hundreds of thousands, may easily amount to a half-acre of solar-collecting chlorophyll surface."