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| Dave Joyce | Sines |
| Dave Joyce | Cosines |
| Dave Joyce | Tangents and Slopes |
| From Stargazers to Starships | Tangent |
| Dan's Math | Similar Triangles and the Basic Six Trig Functions |
| Dave Joyce | Trigonometric Functions |
| Krell Institute | Definitions of the Trig Functions |
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| Math.com | Trig Functions: Overview |
| Math.com | Trig Functions: The Functions |
| MathsRevision.net | Sin, Cos and Tan |
| Project A Level | Sin, Cos, Tan |
| Project A Level | Sec, Cosec, Cot |
| Teaching Treasures | Tangent, Sine, Cosine, Hypotenuse and Area |
| All About Circuits | Right Triangle Trigonometry |
| Dan's Math | Solving Right Triangles |
| Dave Joyce | Trigonometry of Right Triangles |
| M. G. Settle | Basics and Right Triangles |
| Dan's Math | Circles, Angles, Radians |
| Krell Institute | Conversion Between Degrees and Radians |
| M. G. Settle | Circles and Radians |
| Math.com | Trig Functions: Unit Modes |
| NAME Project | Radian Measure |
| Project A Level | Radians |
| Dan's Math | Graphs of Trig Functions |
| GCSE BiteSize Revision | Graphs of sin(x), cos(x), and tan(x) |
| GCSE BiteSize Revision | Transformations of Graphs; y = asin(bx) and y = acos(bx) |
| Krell Institute | Graphs of the Trigonometric Functions |
| Krell Institute | Summary Statement on Graphing Sine and Cosine Functions |
| Krell Institute | Graphs of the Other Four Trigonometric Functions |
| Math.com | Trigonometric Graphs |
| All About Circuits | Non-right Triangle Trigonometry |
| Dave Joyce | Trigonometry of Oblique Triangles |
| Krell Institute | Trig Functions of Angles Lying on the Axes |
| Krell Institute | Trig Functions of Any Angle - The Generalization |
| From Stargazers to Starships | Deriving Sines and Cosines |
| From Stargazers to Starships | Deriving sin(a+b) and cos(a+b) |
| Dave Joyce | Applications of Trigonometry |
| Krell Institute | Estimating the Height of a Building |
| Krell Institute | Harmonic Motion |
| Krell Institute | Average Temperature |
| MathsRevision.net | Bearings |
| CatCode | Frequently Asked Questions About Trigonometry |
| Dave Joyce | Computing Trigonometric Functions |
| Dave Joyce | Trigonometry Began with Chords |
| From Stargazers to Starships | How to Tell Sines from Cosines |
| From Stargazers to Starships | Trigonometry Beyond 90° |
| Integrated Publishing | Angle Between Two Lines |
| Krell Institute | 30°- 60°- 90° and 45°- 45°- 90° Triangles |
| M. G. Settle | Inverse Trig Functions |
| MathsRevision.com | Trig. Advanced Examples |
| GCSE BiteSize Revision | Plotting Sine and Cosine Graphs |
| University of Vienna | Definition of the Trig Functions |
| University of Vienna | The Graphs of sin, cos, and tan |
| GCSE BiteSize Revision | Sine and Cosine Graph TestBite |
| Krell Institute | Graphing Exercises |
| University of Vienna | Recognize Functions 3 |
| University of Vienna | Recognize Graphs 3 |
| EdHelper | Geometry Worksheets |
| EdHelper | Trigonometry Worksheets |