Circle Area

//function calcSircleArea(r) - func with parameter r (radius)

function calcCircleArea(r){ 
//area
  var area=Math.PI*r*r;

 
return area;
//console.log(arguments); --prints arguments of the function
}

function printArea(){

document.getElementById('print').innerHTML='r = 7 area= '+calcCircleArea(7)+'</br>'+ 'r= 1.5 area ='+calcCircleArea(1.5)+'</br>'+ 'r= 20 area ='+calcCircleArea(20);

}
window.onload=printArea;