Math.PI
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 Math.PI * (radius + radius);
}
calculateCircumference(1); // 6.283185307179586
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.pi |
Browser compatibility
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