This is an example of i exactly want it but a with using namespace and pause and constants

20. Pizza Pi Joe's Pizza Palace needs a program to calculate the number of slices a pizza of any size can be divided into. The program should perform the following steps: A) Ask the user for the diameter of the pizza in inches. B) Calculate the number of slices that may be taken from a pizza of that size. A) Display a message telling the number of slices. To calculate the number of slices that may be taken from the pizza, you must know the following facts: . Each slice should have an area of 14.125 inches. . To calculate the number of slices, simply divide the area of the pizza by 14.125. The area of the pizza is calculated with this formula: Area r NOTE: is the Greek letter pi. 3.14159 can be used as its value. The variable r is the radius of the pizza. Divide the diameter by 2 to get the radius. Make sure the output of the program displays the number of slices in fixed-point nota- tion, rounded to one decimal place of precision. Use a named constant for pi 6 nincludecstring using namespace std cout ce The pizza