Consider a sphere of radius r, then the volume of the sphere is given by,
[tex]V=\frac{4}{3}\pi\times r^3[/tex]
Here
[tex]\pi=3.14[/tex]
Now let us consider a cylinder of with base radius r and height h, as in the figure,
The area is the total area of the base surface and the niddle surface.
This can be written as,
[tex]A=2\pi(h+r)[/tex]
Consider a sphere of radius 2 cm, the volume can be calculated as,
[tex]v=\frac{4}{3}\times3.14\times2^3=\frac{4}{3}\times3.14\times2\times2\times2=33.49cm^3[/tex]
