*Choose Index below for a list of all words and phrases defined in this glossary.*

**Radian **- Unit of angular measurement. There are 2 pi radians in the circumference of a circle, where pi is the constant ratio of the circumference to the diameter (pi = 3.14159...).

[Category=Data Quality ]

*Source: iSixSigma, 19 February 2011 11:49:13, http://www.isixsigma.com/index.php?option=com_glossary *

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**radian** - [Euclidean geometry] The angle subtended by an arc of a circle that is the same length as the radius of the circle, approximately 57 degrees, 17 minutes, and 44.6 seconds. There are 2Ï€ radians in one complete rotation.

[Category=Geospatial ]

*Source: esri, 24 July 2012 09:20:41, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation *

Data Quality Glossary. A free resource from GRC Data Intelligence. For comments, questions or feedback: dqglossary@grcdi.nl