Write a $C++$ code to calculate the surface area of a cone. This program reads input $($radius

and height$)$ from the keyboard and prints the area of the cone on the screen.

The surface area of the cone is represented as:

$A=r(r+\sqrt[\phantom{2}]{r^2+h^2})$ where

$r$ is the radius, $h$ is the height, and $$ is $3\mathrm{.}14.$

a$.$ Declare a constant variable named PI and assign $3\mathrm{.}14$ to the constant variable.

b$.$ Using cout and cin, Prompt for and read in the value of radius from the keyboard.

c$.$ Using cout and cin, Prompt for and read in the value of vertical height from the keyboard.

d$.$ Compute the surface area of the cone using the equation mentioned above.

More Hints:

You should use pow $()$ function to calculate $r^2$ and $h^2.$ A sqrt $()$ function is used

to compute the square root. To enable these functions, you need to include appropriate

math library.

Use floating point datatype for radius, height, and area.