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 of considerable importance in surveying, navigation, and astronomy.

Sections in this article:

• Introduction
• Extension of the Trigonometric Functions
• The Basic Trigonometric Functions

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