| Basic Trigonometry | | Cosine, sine and tangent are defined. The Pythagorean theorem is illustrated as well the number of degrees in a many sided figure. |
| GCSE Maths: Trigonometry | | Explains right triangle properties, historic background, the Pythagorean theorem, and trigonometric functions. Includes definition of terms and illustrations. |
| Trigonometry | | Introduction to trigonometry. Includes links to trig-based animations and definitions. | |
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