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

Solution:

(i) Given radius of the sphere, r = 14 cm

Surface area of the sphere = 4r2

= 4×(22/7)×142

= 4×22×14×2

= 2464 cm3

Hence the surface area of the sphere is 2464 cm2.

(ii) Given radius of the sphere, r = 10.5 cm

Surface area of the sphere = 4r2

= 4×(22/7)×10.52

= 1386 cm3

Hence the surface area of the sphere is 1386 cm2.