**PI:**

The ratio of the circumference of a circle to its diameter, approximately 3.14159.

**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.

**Example**

<html>

<head>

<title>Calculate PI Value</title>

**<script language="javascript">**

document.write(Math.PI);

**</script>**

</head>

</html>

**OUTPUT**

3.141592653589793

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