Q. 13.8( 4 Votes )
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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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