#### Radian

A

*radian* is a measurement of angle based upon a fundamental property of circles. Its

unit is that angle where the amount of circumference subtended is equal to the radius of that circle (which turns out to be 57.296

degrees). There are 2 *

`PI` *radians* in a circle (360 degrees).

Although degrees are more commonly used in day-to-day references,

*radians* are more common in computer- and science-related tasks. All

LSL functions that require angles use

*radians* but

SL's object

editor uses degrees in the

rotation fields.

*Radians* are most commonly used in conjunction with

`PI`. One full circle (360 degrees) equals 2 *

`PI` (

`TWO_PI`)

*radians*, one half-circle (180 degrees) equals

`PI` and 90 degrees equals one-half of

`PI` (

`PI_BY_TWO`).

Conversion from

*radians* to degrees, and vice versa, is easy with the constants

`RAD_TO_DEG` and

`DEG_TO_RAD`.

Types |

Quaternions |

Rotation |

Constants