Linked from

The 22 pages that link to Trigonometry, each with the reason it gives.

• Euclidean geometryRelated: Its functions extend Euclidean triangle relationships into calculation and measurement.

• CircleNarrower topic: The unit circle gives a geometric definition of sine and cosine.

• TriangleNarrower topic: Triangle side-angle rules form the basis of trigonometric calculations.

• AngleNarrower topic: It uses angle measures to relate directions, distances, and ratios.

• HipparchusRelated: Hipparchus used geometric calculations to relate observations and celestial positions.

• PiNarrower topic: Angles in radians and trigonometric periods are expressed using pi.

• GeometryRelated: It converts geometric relationships between angles and lengths into practical calculations.

• Regular polygonNarrower topic: Right triangles formed by radii give side, apothem, and area formulas.

• Similar trianglesNarrower topic: Equal angles in similar triangles make trigonometric ratios independent of triangle size.

• Greek mathematicsNarrower topic: Greek astronomy fostered early tables and methods for relating arcs, chords, and angles.

• Triangle geometryRelated: Its laws calculate unknown sides and angles from partial triangle data.

• Al-BiruniRelated: Al-Biruni used trigonometric methods in astronomy, geography, and the calculation of distances.

• Nasir al-Din al-TusiRelated: Al-Tusi helped establish trigonometry as a distinct mathematical discipline.

• Trigonometric identityNarrower topic: Identities are a central tool within this broader subject.

• SexagesimalRelated: Angular notation inherited from sexagesimal measurement became standard in trigonometric practice.

• Ulugh BegRelated: Astronomers used trigonometric methods to calculate positions from observations.

• François VièteRelated: Viète developed trigonometric identities and applied algebraic reasoning to trigonometric problems.

• Scalene triangleNarrower topic: Trigonometric methods solve scalene triangles from suitable side and angle measurements.

• De Moivre's formulaNarrower topic: The identity extends angle relationships into powers of complex numbers.

• GradianRelated: Trigonometric calculations can use gradians when functions are set to that unit.

• Henry BriggsRelated: Briggs’s tables included logarithms of trigonometric functions, useful in surveying and navigation.

• Steiner–Lehmus theoremRelated: Sine-rule arguments can compare the two bisectors through the triangle’s angles.