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// jshint esversion: 6

//define the function

function areaOfCircle(radius){
   return Math.PI * radius ** 2;
}

//test the function

//declare variables
let radius1, radius2, area1, area2;

//assign inputs
radius1 = 1;
radius2 = 5;

//call the function
area1 = areaOfCircle(radius1);  //unit circle makes a good test
area2 = areaOfCircle(radius2);

//output the results
console.log("area1 = " + area1 + " area2 = " + area2); 
alert("area1 = " + area1 + " area2 = " + area2);