Trigonometry

n. branch of mathematics dealing with the relations between the sides and angles of triangles

Trigonometry (from Greek trigōnon "triangle" + metron "measure"), informally called trig, is a branch of mathematics that deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees (right angled triangles). It specifically deals with the relationships between the sides and the angles of triangles; the trigonometric functions, and calculations based upon them. The insights of trigonometry permeate other branches of geometry, such as the study of spheres using spherical trigonometry. Trigonometry has important applications in many branches of pure mathematics as well as of applied mathematics and, consequently remains applicable in natural sciences. Trigonometry is usually taught in secondary schools, often in a precalculus course.
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Noun
1. the mathematics of triangles and trigonometric functions
(synonym) trig
(hypernym) pure mathematics
(hyponym) spherical trigonometry
(classification) mathematics, math, maths

(n.)
That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.
  

(n.)
A treatise in this science.
  

Synonyms and related words:
Boolean algebra, Euclidean geometry, Fourier analysis, Lagrangian function, algebra, algebraic geometry, analysis, analytic geometry, arithmetic, associative algebra, binary arithmetic, calculus, circle geometry, descriptive geometry, differential calculus, division algebra, equivalent algebras, game theory, geodesy, geometry, goniometry, graphic algebra, group theory, higher algebra, higher arithmetic, hyperbolic geometry, infinitesimal calculus, integral calculus, intuitional geometry, invariant subalgebra, inverse geometry, line geometry, linear algebra, mathematical physics, matrix algebra, metageometry, modular arithmetic, n-tuple linear algebra, natural geometry, nilpotent algebra, number theory, plane trigonometry, political arithmetic, projective geometry, proper subalgebra, quaternian algebra, reducible algebra, set theory, simple algebra, solid geometry, speculative geometry, spherical trigonometry, statistics, subalgebra, systems analysis, topology, trig, universal algebra, universal geometry, vector algebra, zero algebra