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JavaScript - Math.PI property example
16 points
The Math.PI property returns π number (3.141592653589793...).
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console.log( Math.PI );2
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// Math.PI with circle:4
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// 1. Circle surface area:6
var radius = 5;7
var area = Math.PI * Math.pow(radius, 2);8
console.log( area ); // 78.539816339744839
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// 2. Circle circumference:11
var radius = 5;12
var circumference = 2 * Math.PI * radius;13
console.log( circumference ); // 31.41592653589793| Syntax | Math.PI |
| Result | π number (3.141592653589793...). |
| Description |
|
To calculate PI number Nilakantha series can be used.
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function computePi(iterations) {2
var approximation = 3;3
for (var i = 0, a = 2; i < iterations; ++i) {4
approximation += 4 / (a * (++a) * (++a));5
approximation -= 4 / (a * (++a) * (++a));6
}7
return approximation;8
}9
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// Usage example:12
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console.log( computePi( 1 ) ); // 3.133333333333333314
console.log( computePi( 2 ) ); // 3.139682539682539615
console.log( computePi( 5 ) ); // 3.141406718496501816
console.log( computePi( 10 ) ); // 3.14156573465854717
console.log( computePi( 20 ) ); // 3.14158902894077618
console.log( computePi( 50 ) ); // 3.141592410971982419
console.log( computePi( 100 ) ); // 3.14159262280484820
console.log( computePi( 200 ) ); // 3.141592649712726421
console.log( computePi( 500 ) ); // 3.14159265334054422
console.log( computePi( 1000 ) ); // 3.14159265355859423
console.log( computePi( 2000 ) ); // 3.14159265358589524
console.log( computePi( 5000 ) ); // 3.141592653589538