Back # Math.PI

The ** Math.PI** property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:

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

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).

`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

Created by Mozilla Contributors, license: CC-BY-SA 2.5