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trigonometry

Trigonometry is the branch of math that deals with calculations related to the sides and angles of triangles. (noun)

An example of trigonometry is what architects use to calculate distances.

See trigonometry in Webster's New World College Dictionary

the branch of mathematics that deals with the ratios between the sides of a right triangle with reference to either acute angle (trigonometric functions), the relations between these ratios, and the application of these facts in finding the unknown sides or angles of any triangle, as in surveying, navigation, engineering, etc.

Related Forms:

trigonometric adjective or trigonometrical
trigonometrically adverb

See trigonometry in American Heritage Dictionary 4

(trĭgˌə-nŏmˈĭ-trē)

noun

The branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions.

Related Forms: