The surface area A of a sphere of radius R is given by the equation A = 4pi*R2, where pi equals 3.1416 (to 5 digits). Calculate the area of a sphere which has a radius of 2 m.
If 2600 grains of sand are uniformly spread out on the surface of the sphere, how many grains of sand are there on each square meter? HINT: We need to divide the number of grains of sand by the number of square meters of the sphere's surface.
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