So I created a .js file to calculate the area of a circle and calculateArea() needs to calculate it.
The only thing that it does is the prompt(). What am I doing wrong?

function calculateArea(myRadius){

  var area = (myRadius * myRadius * Math.PI);

  return area;



  function MyArea(){

    calculateArea(myRadius);

    alert(A circle with a  + myRadius + 

          centimeter radius has an area of  + area + 

          centimeters. <br> + myRadius + 

          represents the number entered by the user <br> + area +

          represents circle area based on the user input.);  

  }      

}

var myRadius = parseFloat(prompt(Enter the radius of your circle in cm:,0));

calculateArea(myRadius);