text: const myCircle = {
  circumference: 0,
  area: 0,
  };
  
  const calculateArea = function(circle, r) {
  circle.circumference = 2 * Math.PI * r;
  circle.area = Math.PI * r * r;
  return circle;
  };
  
  console.log(calculateArea(myCircle, 5));
  
  