Find the surface area of a sphere of radius:

(i) Given Radius = 10.5 cm

Surface area $=4 \pi r^{2}$

$=4 \times 22 / 7 \times(10.5)^{2}$

$=1386 \mathrm{~cm}^{2}$

(ii) Given radius = 5.6 cm

Surface area $=4 \pi r^{2}$

$=4 \times 22 / 7 \times(5.6)^{2}$

$=394.24 \mathrm{~cm}^{2}$

(iii) Given radius $=14 \mathrm{~cm}$

Surface area $=4 \pi r^{2}$

$=4 \times 22 / 7 \times(14)^{2}$

$=2464 \mathrm{~cm}^{2}$