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Lets pretend that the Earth is a perfect sphere. Surface area of a sphere = 4(pi)(radius)^2. The radius of earth is 6378.1 km. Plug that into your equation and you'll get your answer.
The radius of the earth is 6400 km.The total surface area is 4*pi*radius square
The surface area pf the Earth is on a sphere, not a flat surface.
Because the surface of the earth is always changing.
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