math-constants-javascript.md

title	ms.custom	ms.date	ms.prod	ms.reviewer	ms.suite	ms.technology	ms.tgt_pltfrm	ms.topic	dev_langs	helpviewer_keywords	ms.assetid	caps.latest.revision	author	ms.author	manager
Math Constants (JavaScript) | Microsoft Docs		01/18/2017	windows-client-threshold			devlang-javascript		language-reference	JavaScript TypeScript DHTML	LN2 constant [JavaScript] E constant [JavaScript] LOG10E constant [JavaScript] SQRT1_2 constant [JavaScript] LOG2E constant [JavaScript] Math.SQRT2 constant [JavaScript] PI constant [JavaScript] Math.LOG2E constant [JavaScript] constants [JavaScript], math Math.E constant [JavaScript] logarithm consants [JavaScript] Math.LOG10E constant [JavaScript] Math.SQRT1_2 constant [JavaScript] SQRT2 constant [JavaScript] square root constants [JavaScript] Math.PI constant [JavaScript] math constants [JavaScript] LN10 constant [JavaScript] Math.LN2 constant [JavaScript] Math.LN10 constant [JavaScript]	8a674046-cb99-4103-92be-83697fba6344	13	mikejo5000	mikejo	ghogen

Math Constants (JavaScript)

Math constants return constant values that are properties of the Math object.

Math Object Constants

The following table lists constant values that are properties of the Math object.

Constant	Description	Approximate value
Math.E	The mathematical constant e. This is Euler's number, the base of natural logarithms.	2.718
Math.LN2	The natural logarithm of 2.	0.693
Math.LN10	The natural logarithm of 10.	2.302
Math.LOG2E	The base-2 logarithm of e.	1.443
Math.LOG10E	The base-10 logarithm of e.	0.434
Math.PI	Pi. This is the ratio of the circumference of a circle to its diameter.	3.14159
Math.SQRT1_2	The square root of 0.5, or, equivalently, one divided by the square root of 2.	0.707
Math.SQRT2	The square root of 2.	1.414

Example

The following example illustrates how to use the Math.PI constant.

var radius = 3;  
var area = Math.PI * radius * radius;  
document.write(area);  
  
// Output: 28.274333882308138  
  

Requirements

[!INCLUDEjsv1]

Applies To: Math Object

See Also

Number Constants
JavaScript Constants