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volume of sphere = (4π r³)/3
⇒4851 =( 4×22 ×r³)/21
⇒r³ = 1157.625
⇒r =∛1157.625
⇒r =10.5 cm
surface area = 4π r² = 1386 cm²
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1386cm2 is ans. by substitution in formulas
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