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JavaScript - Math.PI property example

16 points
Created by:
Kate_C
22250

The Math.PI┬áproperty returns ¤Ç number (3.141592653589793...).

// ONLINE-RUNNER:browser;

console.log( Math.PI );

// Math.PI with circle:

// 1. Circle surface area:
var radius = 5;
var area = Math.PI * Math.pow(radius, 2);
console.log( area ); // 78.53981633974483

// 2. Circle circumference:
var radius = 5;
var circumference = 2 * Math.PI * radius;
console.log( circumference ); // 31.41592653589793

1. Documentation

SyntaxMath.PI
Result¤Ç number (3.141592653589793...).
Description

PI┬áis a static property that keeps┬á¤Ç number what is one of most important┬ámathematical constant.


2. Nilakantha series example

To calculate PI number Nilakantha series can be used.

Nilakantha series used to calculate Math.PI in JavaScript.
Nilakantha series used to calculate Math.PI in JavaScript.
// ONLINE-RUNNER:browser;

function computePi(iterations) {
	var aproximation = 3;

  	for (var i = 0, a = 2; i < iterations; ++i) {
      	aproximation += 4 / (a * (++a) * (++a));
      	aproximation -= 4 / (a * (++a) * (++a));
    }
  
  	return aproximation;
}

// Usage example:

console.log( computePi(    1 ) ); // 3.1333333333333333
console.log( computePi(    2 ) ); // 3.1396825396825396
console.log( computePi(    5 ) ); // 3.1414067184965018
console.log( computePi(   10 ) ); // 3.141565734658547
console.log( computePi(   20 ) ); // 3.141589028940776
console.log( computePi(   50 ) ); // 3.1415924109719824
console.log( computePi(  100 ) ); // 3.141592622804848
console.log( computePi(  200 ) ); // 3.1415926497127264
console.log( computePi(  500 ) ); // 3.141592653340544
console.log( computePi( 1000 ) ); // 3.141592653558594
console.log( computePi( 2000 ) ); // 3.141592653585895
console.log( computePi( 5000 ) ); // 3.141592653589538

References

  1. Pi - Wikipedia

JavaScript - Math (EN)

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