Unit of angular measurement equal to the angle at the center of a circle subtended by an arc equal in length to the radius. Equals about 57.296 degrees.
Found op http://www.encyclo.co.uk/visitor-contributions.php

[n] - the unit of plane angle adopted under the System International d`Unites

SI Supplementary UnitThe radian is the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius.

(rad) Compare with steradian. An angle with vertex at the center of a circle of radius r that encompasses an arc of length r.
Found op http://antoine.frostburg.edu/chem/senese/101/glossary/r.shtml

Ra'di·an (- a n) noun [ From Radius .] (Math.) An arc of a circle which is equal to the radius, or the angle measured by such an arc.
Found op http://www.encyclo.co.uk/webster/R/3

<mathematics> An arc of a circle which is equal to the radius, or the angle measured by such an arc. ... Origin: From Radius. ... Source: Websters Dictionary ... (01 Mar 1998) ...

noun the unit of plane angle adopted under the Systeme International d`Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)

• (n.) An arc of a circle which is equal to the radius, or the angle measured by such an arc.

(from the article `steradian`) ...complete surface area of a sphere is 4 times the square of its radius, the total solid angle about a point is equal to 4 steradians. Derived from ... Numerical values can be assigned to angles by selecting a unit of measure. The most common units are the degree and ...
Found op http://www.britannica.com/eb/a-z/r/3

A measure of angle. 360 degrees = 2p radians. The radian measure of an angle is given geometrically by the ratio arc length/radius of the arc of a circle with the angle defined at its center and subtending the arc.
Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html

(rad) Type: Term Pronunciation: rā′dē-ăn Definitions: 1. A supplementary SI unit of plane angle.
Found op http://www.medilexicon.com/medicaldictionary.php?t=74796

[band] Radian is an Austrian experimental music group. Their music touches on instrumental rock, post-rock, jazz and electronica, and is notable for imitating some of the more demanding musical structures of intelligent dance music. The trio was formed in 1996, in Vienna. Members are: == Dis...

Radian is the ratio between the length of an arc and its radius. The radian is the standard unit of angular measure, used in many areas of mathematics. The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit. The SI...

A measure of angle. 360 degrees = 2p radians. The radian measure of an angle is given geometrically by the ratio arc length/radius of the arc of a circle with the angle defined at its center and subtending the arc.
Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A

One of two supplementary (dimensionless) units in the SI system of units (the other being the steradian). The radian is a unit of plane angle. There are 2p radians in a complete circle. One radian = 180/p degrees, or approximately 57.296°.

The radian is the SI unit (symbol rad) of plane angles, an alternative unit to the degree. It is the angle at the centre of a circle when the centre is joined to the two ends of an arc equal in length to the radius of the circle. There are 2 pi (approximately 6.284) radians in a full circle (360 deg...
Found op http://www.probertencyclopaedia.com/browse/AR.HTM

SI unit of plane angles, an alternative unit to the degree. It is the angle at the centre of a circle when the centre is joined to the two ends of an arc (part of the circumference) equal in length to the radius of the circle. There are 2π (approximately 6.284) radians in a full circle (360°)....
Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0006725.html

[Morituri] Radian (Louis Armanetti) is a fictional character, a superhero in the Marvel Universe, member of the Strikeforce: Morituri. The character was created by Peter B. Gillis and Brent Anderson. ==Publication history== Radian (Louis Armanetti) was created by writer Peter B. Gillis and a...

[EP] Radian is the debut EP album by Portuguese singer Ana Free. It was released on February 9, 2010, in the U.S. and its lead single was "Questions in My Mind", released a week after. ==Writing and composition== The EP contains five songs, several of which are Ana Free`s most popular origin...

1) Angle of a circle 2) Angular measurement 3) Angular unit 4) Math arc 5) Rad

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