The followingoutline is provided as an overview of and topical guide to trigonometry:

Trigonometry – branch ofmathematics that studies the relationships between the sides and the angles intriangles. Trigonometry defines thetrigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such aswaves.

• Geometry – mathematics concerned with questions of shape, size, the relative position of figures, and the properties of space. Geometry is used extensively in trigonometry.
• Angle – the angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in a plane, but this plane does not have to be a Euclidean plane.
• Ratio – a ratio indicates how many times one number contains another

• Trigonometry
• Trigonometric functions
• Trigonometric identities
• Euler's formula

• Archimedes
• Aristarchus
• Aryabhata
• Bhaskara I
• Claudius Ptolemy
• Euclid
• Hipparchus
• Madhava of Sangamagrama
• Ptolemy
• Pythagoras
• Regiomontanus

• Aristarchus's inequality
• Bhaskara I's sine approximation formula
• Greek astronomy
• Indian astronomy
• Jyā, koti-jyā and utkrama-jyā
• Madhava's sine table
• Ptolemy's table of chords
• Rule of marteloio
• Āryabhaṭa's sine table

Uses of trigonometry

• Acoustics
• Architecture
• Astronomy
• Biology
• Cartography
• Chemistry
• Civil engineering
• Computer graphics
• Cryptography
• Crystallography
• Economics
• Electrical engineering
• Electronics
• Game development
• Geodesy
• Mechanical engineering
• Medical imaging
• Meteorology
• Music theory
• Number theory
• Oceanography
• Optics
• Pharmacy
• Phonetics
• Physical science
• Probability theory
• Seismology
• Statistics
• Surveying

• Abbe sine condition
• Greninger chart
• Phasor
• Snell's law

• Equant
• Parallax
• Dialing scales

• Greninger chart

• Hansen's problem
• Snellius–Pothenot problem
• Great-circle distance – how to find that distance if one knows thelatitude andlongitude.
• Resection (orientation)
• Vincenty's formulae
• Geographic distance
• Triangulation in three dimensions

• Haversine formula
• Rule of marteloio

• Belt problem
• Phase response
• Phasor
• Rake (angle)

• Dialing scales
• Gunter's quadrant
• Gunter's scale
• Protractor
• Scale of chords

• Inverse trigonometric functions
• List of integrals of trigonometric functions
• List of integrals of inverse trigonometric functions
• Regiomontanus' angle maximization problem
• Tangent half-angle substitution
• Trigonometric integral
• Trigonometric substitution
• Applications
  • Fourier transform
  • Wave equation

• For examples of trigonometric functions asgenerating functions incombinatorics, seeAlternating permutation.
• Dirichlet kernel
• Euler's formula
• Exact trigonometric values
• Exponential sum
• Trigonometric integral
• Trigonometric polynomial
• Trigonometric series

• Altern base
• Angle
  • Plane angle
  • Solid angle
  • Spherical angle
  • Right angle
• Angle excess
• Angular distance
• Angular unit
  • Degree (angle)
  • Gon (angle) (aka Grad, Gradian)
  • Radian
  • Turn (angle)
• Brocard points
• Chord (geometry)
• Circle (also seeList of circle topics)
  • Unit circle
• Hypotenuse
• Opposites post
• π (pi)
• Ptolemy's theorem
• Pythagorean theorem
• Regiomontanus' angle maximization problem
• Thales' theorem
• Trigonometric function
• Trigonometry of a tetrahedron
• Triangle (also seeList of triangle topics)

• Sine,Cosine,Tangent (trigonometric function),Cotangent,Secant (trigonometric function),Cosecant – seeTrigonometric function
• atan2
• cis—seeEuler's formula
• Cofunction
• Exsecant
• Gudermannian function
• Inverse trigonometric functions
• Jyā, koti-jyā and utkrama-jyā
• Versine

Trigonometric identity (list)

• De Moivre's formula
• Euler's formula
• Hermite's cotangent identity
• Lagrange's trigonometric identities
• Morrie's law
• Proofs of trigonometric identities
• Pythagorean trigonometric identity
• Tangent half-angle formula

Solution of triangles

• Law of sines
• Law of cosines
• Law of tangents
• Law of cotangents
• Mollweide's formula

• Chebyshev polynomials
• Conway triangle notation
• Exact trigonometric constants
• Generalized trigonometry
• Gudermannian function
• Lissajous curve
• Polar sine
• Rational trigonometry
• Spread polynomials

• Abbe error
• Hypot
• Prosthaphaeresis
• Trigonometric interpolation
• Kunstweg, an algorithm for computing sines, introduced in the late 1500s

Trigonometric tables

• Generating trigonometric tables
• Āryabhaṭa's sine table
• Bhaskara I's sine approximation formula
• Madhava's sine table
• Ptolemy's table of chords, written in the second century A.D.
• Rule of marteloio
• Canon Sinuum, listing sines at increments of two arcseconds, published in the late 1500s

Spherical trigonometry

• Half-side formula
• Haversine formula

mnemonics in trigonometry

• All Students Take Calculus

• List of integrals of trigonometric functions
• List of integrals of inverse trigonometric functions
• List of trigonometric identities
• Table of mathematical symbols

• Algebra
• Hyperbolic function
• List of exponential topics
• Outline of geometry
• Precalculus
• Spherical geometry
• Table of mathematical symbols

Wikibooks has a book on the topic of:Trigonometry

• An introduction to trigonometry
• Benjamin Banneker's Trigonometry Puzzle atConvergence
• Dave's short trig courseArchived 2008-06-15 at theWayback Machine
• Trigonometric Delights, byEli Maor, Princeton University Press, 1998. Ebook version, in PDF format, full text presented.
• Trigonometry by Alfred Monroe Kenyon and Louis Ingold, The Macmillan Company, 1914. In images, full text presented.
• Trigonometry FAQ
• Trigonometry on Mathwords.com index of trigonometry entries on Mathwords.com
• Trigonometry on PlainMath.netArchived 2007-10-27 at theWayback Machine Trigonometry Articles from PlainMath.Net

• Outlines of mathematics and logic
• Outlines
• Trigonometry
• Mathematics-related lists

• Articles with short description
• Short description matches Wikidata
• Webarchive template wayback links