Page No 225:
Question 1:
Find the surface area of a sphere of radius:
(i) 10.5 cm (ii) 5.6 cm (iii) 14 cm
(i) Radius (r) of sphere = 10.5 cm
Surface area of sphere = 4πr2
Therefore, the surface area of a sphere having radius 10.5cm is 1386 cm2.
(ii) Radius(r) of sphere = 5.6 cm
Surface area of sphere = 4πr2
Therefore, the surface area of a sphere having radius 5.6 cm is 394.24 cm2.
(iii) Radius (r) of sphere = 14 cm
Surface area of sphere = 4πr2
Therefore, the surface area of a sphere having radius 14 cm is 2464 cm2.
