What does surface area equals?

Surface area refers to the total area that the surface of a three-dimensional object occupies. It is calculated by summing the areas of all the object's faces or surfaces. The formula for surface area varies depending on the shape; for instance, the surface area of a cube is (6a^2), where (a) is the length of a side, while the surface area of a sphere is (4\pi r^2), where (r) is the radius. Understanding surface area is essential in fields like engineering, architecture, and manufacturing, as it impacts material usage and heat transfer.