Question

calculate the surface area of a sphere whose volume is 4851 sq cm

Answer 1

Volume of sphere = 4/3 ×22/7×r³
4851= 4/3 × 22/7 × r³
4851 × 3 = 4 × 22/7 × r³
14553 = 4 × 22/7 × r³
r³ = 14553 × 7 / 22 × 4 
r³ = 101871/ 88
r³ = 1157.625 
r = √1157.625
r = 34.02/2
r = 17.01 or 17 cm (approx)

surface area of sphere = 4 × 22/7 × 17 ×17 
                                     = 25432 / 17
                                     = 3633.14 cm²

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