​

//  By Abhijeet S. Mankani

​

//  Source : Wikipedia : https://en.wikipedia.org/wiki/Approximations_of_%CF%80

let img;

function preload() {

  img = loadImage('Clipboard03.png');

}

​

​

let n=1;  //nth term

let limit=49;  //Also gives ame value

//  let limit=171;

//  Max number till number being in JS variable length limit

​

//  Accurate upto 16 digits!!

​

​

function setup() {

  createCanvas(691,500);

  clear();

  let Pi=calc();

  console.log("Pi= " + Pi);

  textSize(55);

  textAlign(CENTER);

  text("Pi = " + Pi,width/2,400);

  image(img,0,0);

  // Wikipedia Page

}

​

function calc(){

  let halfpi=1;

  for(n=1;n<=limit;n++){

    let t=factorial(n)/den(n)

    halfpi+=t;

  }

  return(2*halfpi);

}

​

​

​

function factorial(n){

  if(n==1) {

    return(1);

  }

  else {

    return(n*factorial(n-1));

  }

}

function den(n){

  let a=1;

  for(let i=1;i<=1+(2*n);i+=2){

    a*=i;

  }

  return a;

}