JavaScript - Math.PI Property Example - Dirask

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The Math.PI property returns π 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

Syntax	Math.PI
Result	π number (3.141592653589793...).
Description	PI is a static property that keeps π number what is one of the most important mathematical constants.

2. Nilakantha series example

To calculate PI number Nilakantha series can be used.

// ONLINE-RUNNER:browser; function computePi(iterations) { var approximation = 3; for (var i = 0, a = 2; i < iterations; ++i) { approximation += 4 / (a * (++a) * (++a)); approximation -= 4 / (a * (++a) * (++a)); } return approximation; } // 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

Alternative titles

1. JavaScript - Math.PI documentation with examples
2. js - Math.PI property documentation with examples

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JavaScript - Math documentation (EN)

Math.E Math.PI Math.abs() Math.acos() Math.asin() Math.atan() Math.atan2() Math.ceil() Math.cos() Math.exp() Math.floor() Math.log() Math.log10() Math.log2() Math.max() Math.min() Math.pow() Math.random() Math.round() Math.sign() Math.sin() Math.sqrt() Math.tan() Math.trunc()

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