$($Area and circumference of a circle$)$ Write a C$++$program that displays the area A and circumference C of a circle that has a radius r $=2\mathrm{.}5$ using the following formulae:

A$=\backslash$pi r$^2$ ; C$=2\backslash$pi r

Your code should carry out the appropriate calculations. Here is a sample run of the

program: