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P=4πR²
P=4*3²π =4*9π
P=36π cm³
V=4/3 πR³
V=4*3³π/3 =4*9*3π/3
V=36π cm³
36π*8,3g =298,8π g
π≈3,14
298,8*3,14 =938,23g ciężar