Answer :

(i) Radius of sphere = 3.5cm


Volume =



= 179.67cm3


Surface area = 4πr2


=


= 2 × 22 × 3.5 = 154 cm2


(ii) R = 4.2cm


Volume =


=


= 310.464cm2


Surface area = 4πr2


=


= 4 × 22 × .6 × 4.2


= 221.76cm2


(iii) R = 5cm


Volume =



= 523.80cm3


Surface area = 4πr2


=


= 314.28cm2 +


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