Question

Find the volume and surface area of a sphere of radius 8.4 cm.

`(pi=22/7)`

Answer 1

Radius of the sphere = 8.4 cm.

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

`= 4/3 xx (22/7) xx 8.4^3`

`= (4 xx 22 xx 84 xx 8.4^2 xx 10^-1)/21`

`= 352 xx 70.56 xx 10^-1`

= 2483.71 cm³

Surface area of a sphere is 4πr²

`= 4 xx (22/7) xx 8.4^2`

`= (4 xx 22 xx 84 xx 8.4 xx 10^-1)/7`

`= 4 xx 22 xx 12 xx 8.4 xx 10^-1`

= 887.04 cm²