Functions worksheet: An overview has been added to the beginning of the js file to alert the user what this program will calculate. The overview message will display in the console and as an alert to the user.
Functions worksheet: he radius variable has been declared in the givens section. It will be defined when the user inputs the radius length at the prompt. A validation conditional statement is used to check if the user didn't input a value (is an empty string) or if it is less than zero. The input is then parsed as a number.