Given user input of the diameter and cost of a circular pizza, display the cost per square inch of the pizza. Note that the area of a circle is $3\mathrm{.}14$ times the square of its radius $($which is half of the diameter.$)$Given user input of the diameter and cost of a circular pizza, display the cost per square inch of the pizza. Note that the area of a circle is $3\mathrm{.}14$ times the square of its radius $($which is half of the diameter.$)$