# cotangent

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## cotangent:

see trigonometry**trigonometry**

[Gr.,=measurement of triangles], a specialized area of geometry concerned with the properties of and relations among the parts of a triangle. Spherical trigonometry is concerned with the study of triangles on the surface of a sphere rather than in the plane; it is

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The following article is from

*The Great Soviet Encyclopedia*(1979). It might be outdated or ideologically biased.## Cotangent

one of the trigonometric functions; denoted by cot or ctn. The cotangent of an acute angle in a right triangle is the ratio of the adjacent side to the opposite side.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

## cotangent

[kō′tan·jənt] (mathematics)

The reciprocal of the tangent. Denoted cot; ctn.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## cotangent

(of an angle) a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the opposite side; the reciprocal of tangent

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005