1. Find the surface area of a sphere of radius: (i) 10.6 cm (ii) 5.6 cm (iii) 14 cm.

. (i) Radius of a sphere (r) = 10.5 cm .. Surface area of the sphere = 4nr2 22 = 4 x x 10.5 x 10.5 = 1386 cm2 (ii} Radius of a sphere (r) = 5.6 cm .. Surface area of the sphere = 4v = 4 x 7 )( 5.6 x 5.6 = 394.24 cm2 (iii} Radius of a sphere (r) = 14 cm • Surface area of the sphere = 4r = 4 x 22 x 14 x 14 2464 cm2