# Trigonometry notes

> CAPS-aligned study notes for Trigonometry in Grade 11 Mathematics. Browse the sections below for explanations, worked examples and exam preparation.

- Page: https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry

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## Sections in Trigonometry

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- [Trigonometric Identities](https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry/trigonometric-identities) — Trigonometric Identities A trigonometric identity is an equation that is true for all values of the variable where the expressions are defined. Unlike trigonometric equations (which are true for…
- [Reduction Formulae](https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry/reduction-formulae) — Reduction Formulae Reduction formulae allow you to express trigonometric functions of any angle in terms of a function of an acute angle (between $0°$ and $90°$). These formulae are based on the CAST…
- [Trigonometric Equations and General Solutions](https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry/trigonometric-equations-and-general-solutions) — Trigonometric Equations and General Solutions A trigonometric equation is an equation involving trigonometric functions that is satisfied by only specific values of the angle — unlike identities,…
- [Sine, Cosine and Area Rules](https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry/sine-cosine-and-area-rules) — Sine, Cosine and Area Rules Up to this point, you have solved right-angled triangles using basic trigonometric ratios. But what about triangles that are not right-angled? The sine rule, cosine rule,…
- [2D Problems Using Trigonometric Rules](https://www.hlayiso.com/grade-11/mathematics/notes/trigonometry/2d-problems-using-trigonometric-rules) — 2D Problems Using Trigonometric Rules In this section, you apply the sine rule, cosine rule, and area rule to solve practical two-dimensional problems. These problems typically involve compound…

## Other Mathematics topics

- [Algebraic expressions, equations and inequalities](https://www.hlayiso.com/grade-11/mathematics/notes/algebraic-expressions-equations-and-inequalities)
- [Number patterns](https://www.hlayiso.com/grade-11/mathematics/notes/number-patterns)
- [Finance, growth and decay](https://www.hlayiso.com/grade-11/mathematics/notes/finance-growth-and-decay)
- [Functions and graphs](https://www.hlayiso.com/grade-11/mathematics/notes/functions-and-graphs)
- [Probability](https://www.hlayiso.com/grade-11/mathematics/notes/probability)
- [Statistics](https://www.hlayiso.com/grade-11/mathematics/notes/statistics)
- [Analytical Geometry](https://www.hlayiso.com/grade-11/mathematics/notes/analytical-geometry)
- [Euclidean Geometry](https://www.hlayiso.com/grade-11/mathematics/notes/euclidean-geometry)

## Frequently asked questions

### What is covered in Trigonometry for Grade 11 Mathematics?

The Trigonometry section covers all key concepts from the Grade 11 Mathematics CAPS curriculum, including detailed explanations, worked examples, and exam preparation tips.

### Are the Trigonometry notes free?

Yes. Each section has a free preview, and a free Hlayiso account lets you read the full notes.

### How do these notes help with exam preparation?

Our Trigonometry notes are CAPS-aligned and include worked examples, common mistakes to avoid, and exam tips — everything you need to prepare for your Grade 11 Mathematics exams.

### Are there quizzes for Trigonometry?

Yes. Hlayiso has quizzes for Trigonometry in Grade 11 Mathematics. Test your understanding after reading the notes.

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