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The Math.PI property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:
Property attributes of Math.PI |
|
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Description
Because PI is a static property of Math, you always use it as Math.PI, rather than as a property of a Math object you created (Math is not a constructor).
Examples
Using Math.PI
The following function uses Math.PI to calculate the circumference of a circle with a passed radius.
function calculateCircumference(radius) {
return 2 * Math.PI * radius;
}
calculateCircumference(1); // 6.283185307179586
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
| ECMAScript 5.1 (ECMA-262) The definition of 'Math.PI' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.PI' in that specification. |
Standard | |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.PI' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |