Examine the following program

Description: This program uses functions to calculate

# the area of a circle, given the radius

import math

def calculateArea $($radius$)$ :

area $=$ math $***$ radius $*****2$

print $("$Area of a circle with a radius of$",$ radius, $"$is$",$

format $($area$,,($:$-2f^{\text{'}\text{'}}\})$

def main$()$:

radius $=$ int $($input $("$Enter the radius:"$)$

calculateArea $($radius$)$

main$()$

a$.$ Label the function definitions and the function calls.

b$.$ The function call and the function definition for calculateAcea each include a variable within the parentheses. The variable in the function call is known as an argument. The variable in the function definition is called a parameter. What is the parameter in the function definition? What is its purpose?

C$.$ In this example the parameter in the function definition and the argument in the function call have the same name. Is this required?