*rad*

Origin of radian

from radius the basic unit of plane angle in the SI system, equal to 57° 17? 44.8? (57.29578°, the angle formed at the center of a circle by two radii cutting off an arc whose length is equal to the radius of the circle): one degree equals 0.017454 radian and 360 degrees equals 2? radians: abbrev. *rad*

Origin of radian

from radiusWebster's New World College Dictionary, Fifth Edition Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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"radian." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/radian>.

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radian. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/radian

noun

A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17&minute;44.6&second;.

Origin of radian

**radian**

When the length of an arc of a circle is equal to the radius of the circle, the angle subtended by that arc equals one radian.

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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**MLA Style**

"radian." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/radian>.

**APA Style**

radian. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/radian

A supplementary unit of the International System used in angular measure. One radian is equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17″44.6&second;.

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**MLA Style**

"radian." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/radian>.

**APA Style**

radian. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/radian

Noun

(*plural* radians)

Origin

From radi(us) + -an

English Wiktionary. Available under CC-BY-SA license.

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**MLA Style**

"radian." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/radian>.

**APA Style**

radian. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/radian

Webster's New World Telecom Dictionary Copyright © 2010 by Wiley Publishing, Inc., Indianapolis, Indiana.

Used by arrangement with John Wiley & Sons, Inc.

Used by arrangement with John Wiley & Sons, Inc.

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**MLA Style**

"radian." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/radian>.

**APA Style**

radian. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/radian

- Is given by sin S=h/3R, (41) or, for a small angle, expressed in minutes, taking the
**radian**as 3438', (42) S = 1146h/R.