Trigonometry is a branch of mathematics that studies the relationships between the sides and the angles in triangles. Trigonometry defines the trigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such as waves.
Geometry – mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. Geometry is used extensively in trigonometry.
Angle – 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 –
Trigonometry
Trigonometric functions
Trigonometric identities
Euler's formula
Archimedes
Aristarchus
Aryabhata
Bhaskara I
Claudius Ptolemy
Euclid
Hipparchus
Madhava of Sangamagrama
Ptolemy
Pythagoras
Regiomontanus
Aristarchus' 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
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
Geography, geodesy, and land surveying
Hansen's problem
Snellius–Pothenot problem
Great-circle distance – how to find that distance if one knows the latitude and longitude.
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 as generating functions in combinatorics, see Alternating permutation.
Dirichlet kernel
Euler's formula
Exact trigonometric constants
Exponential sum
Trigonometric integral
Trigonometric number
Trigonometric polynomial
Trigonometric series
Trigonometry in Galois fields
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 see List 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 see List of triangle topics)
Sine, Cosine, Tangent (trigonometric function), Cotangent, Secant (trigonometric function), Cosecant – see Trigonometric function
atan2
cis—see Euler's formula
Cofunction
Exsecant
Gudermannian function
Inverse trigonometric functions
Jyā, koti-jyā and utkrama-jyā
Versine
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
Law of sines
Law of cosines
Law of tangents
Law of cotangents
Mollweide's formula
More advanced trigonometric concepts and methods
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
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
Half-side formula
Haversine formula
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
Outline of trigonometry Wikipedia (Text) CC BY-SA