The JavaScript Math.PI Property

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

Since PI is a static property of Math, you always use it asMath.PI，not used as a property of the Math object created.

Syntax:

Math.PI

Example

Math.PI;

All browsers fully support the Math.PI property:

Property
Math.PI	Yes	Yes	Yes	Yes	Yes

Writable:	None
Enumerable:	None
Configurable:	None
Return Value:	The numerical representation of PI
JavaScript Version:	ECMAScript 1

Calculate the circumference of a circle through the radius:

Example

function　getCircumference(radius)　{
　　　return　(2　*　Math.PI　*　radius);
}
getCircumference(5);

Calculate the area of a circle through the radius:

Example

function　getArea(radius)　{
　　　return　(Math.PI　*　radius　*　radius);
}
getArea(5);