javascript math pi

1//How to get pi:
2//Way 1:
3Pi = 3.14159;
4//Way 2:
5Pi = Math.PI;

1//pi declare pi= MATH.PI
2var pi = MATH.PI;
3//console
4console.log(pi);
5//screen
6document.write(pi);

1function calculateCircumference(radius) {
2  return 2 * Math.PI * radius;
3}
4
5console.log(Math.PI);
6// expected output: 3.141592653589793
7
8console.log(calculateCircumference(10));
9// expected output: 62.83185307179586
10