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// Program File: areaOfRing2.js

//function definition
function areaOfRing(R, r){
   return Math.PI * (R ** 2 - r ** 2);
}

//test the function

//declare the input and output variables
let outerDiskRadius, innerDiskRadius;
let area1, area2;

outerDiskRadius = 10; 
innerDiskRadius = 8;
area1 = areaOfRing(outerDiskRadius, innerDiskRadius);

outerDiskRadius = 10; 
innerDiskRadius = 8;
area2 = areaOfRing(outerDiskRadius, innerDiskRadius);

//output results (uses backticks)
console.log(`area1 = ${area1} 
area2 = ${area2}`); 

alert(`area1 = ${area1} 
area2 = ${area2}`); 


//this is better: echo the inputs
console.log("outerDiskRadius = " + outerDiskRadius + " innerDiskRadius = " + innerDiskRadius +" area = " + area1); 
alert("outerDiskRadius = " + outerDiskRadius + " innerDiskRadius = " + innerDiskRadius +" area = " + area1);