Question

Find the volume and surface area of a sphere of radius 2.1 cm. `(pi=22/7)`

Answer 1

Radius of the sphere = 2.1 cm.

Volume of a sphere is `4/3pir^3`

`= 4/3 xx (22/7) xx 2.1^3`

`= (4 xx 22 xx 21 xx 2.1^2 xx 10^-1)/21`

`= 88 xx 4.41 xx 10^-1`

= 38.808 cm³

Surface area of a sphere is 4πr²

`= 4 xx (22/7) xx 2.1^2`

`= (4 xx 22 xx 21 xx 2.1 xx 10^-1)/7`

`= 4 xx 22 xx 3 xx 2.1 xx 10^-1`

= 55.44 cm²