Answer :

Surface area of a shere = 4πr2, where r is radius


(i) r is 10.5 cm


surface area = 4 × (22/7) × (10.5)2 = 1386 cm2


(ii) r is 5.6 cm


surface area = 4 × (22/7) × 5.62 = 394.24 cm2


(iii) r is 14 cm


surface area = 4 × (22/7) × 142 = 2464 cm2


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