Find the surface area of a sphere of diameter: (i) 14 cm (ii) 21 cm (iii) 3.5 m

Explanation

Surface area of sphere = `4pir^2`

Radius, `r=d/2`

(i) Diameter, `d=14cm`

S.A of sphere = `4xx22/7xx(14/2)^2`=`616cm^2`

(ii) `d=21cm`

S.A of sphere = `4xx22/7xx(21/2)^2`=`1386cm^2`

(iii) `d=3.5cm`

S.A of sphere = `4xx22/7xx(3.5)^2`=`38.5cm^2`