Answer :

Surface area of a sphere of diameter ‘d’ = πd2


(i) d is 14 cm


surface area = (22/7) × (14)2 = 616 cm2


(ii) d is 21 cm


surface area = (22/7) × (21)2 = 1386 cm2


(iii) d is 3.5 cm


surface area = (22/7) × (3.5)2 = 38.5cm2


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