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

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

**Applies To**: Math Object