The `Math.PI`

property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:

$$\backslash mathtt\{\backslash mi\{Math.PI\}\}\; =\; \backslash pi\; \backslash approx\; 3.14159$$

The `Math.PI`

property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:

$$\backslash mathtt\{\backslash mi\{Math.PI\}\}\; =\; \backslash pi\; \backslash approx\; 3.14159$$

Property attributes of `Math.PI`
| |
---|---|

Writable | no |

Enumerable | no |

Configurable | no |

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).

The following function uses `Math.PI`

to calculate the circumference of a circle with a passed radius.

function calculateCircumference(radius) { return Math.PI * (radius + radius); } calculateCircumference(1); // 6.283185307179586

Specification |
---|

ECMAScript Language Specification # sec-math.pi |

Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |

`PI` |
1 |
12 |
1 |
3 |
3 |
1 |
4.4 |
18 |
4 |
10.1 |
1 |
1.0 |
1.0 |
0.10.0 |

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/PI