Find the Find the surface area of a sphere of radius :
(i) 10.5 cm
(ii) 5.6 cm
(iii) 14 cm
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