# Trigonometry notes

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

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

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## Sections in Trigonometry

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- [Trig ratios in all four quadrants](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/trig-ratios-in-all-four-quadrants) — Trig Ratios in All Four Quadrants In Grade 10 you learned to define the three basic trigonometric ratios — sine, cosine and tangent — using a right-angled triangle. In Grade 11 we extend these…
- [Sine rule, cosine rule and area rule](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/sine-rule-cosine-rule-and-area-rule) — Sine Rule, Cosine Rule and Area Rule Not every triangle contains a right angle. When working with oblique (non-right-angled) triangles, trigonometric ratios alone are not sufficient. We need three…
- [Two-dimensional trigonometry problems](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/two-dimensional-trigonometry-problems) — Two-Dimensional Trigonometry Problems Two-dimensional trigonometry problems involve applying the sine rule, cosine rule and area rule to real-world scenarios. These problems often involve angles of…
- [Trig graphs (sin, cos, tan) and the effect of p](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/trig-graphs-sin-cos-tan-and-the-effect-of-p) — Trig Graphs (sin, cos, tan) and the Effect of p Trigonometric functions produce periodic graphs — patterns that repeat at regular intervals. Understanding these graphs is essential for electrical…
- [Rotating vectors and developing sine and cosine curves](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/rotating-vectors-and-developing-sine-and-cosine-curves) — Rotating Vectors and Developing Sine and Cosine Curves In technical fields such as electrical engineering, alternating current (AC) is the most common form of electrical current. Understanding how…
- [Trigonometric equations](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/trigonometric-equations) — Trigonometric Equations A trigonometric equation is an equation involving one or more trigonometric functions. Solving these equations requires both algebraic techniques and knowledge of the CAST…
- [Reduction formulae and identities](https://www.hlayiso.com/grade-11/technical-mathematics/notes/trigonometry/reduction-formulae-and-identities) — Reduction Formulae and Identities Reduction formulae allow us to express trigonometric functions of any angle as functions of an acute angle (between 0° and 90°). Trigonometric identities are…

## Other Technical Mathematics topics

- [Analytical geometry](https://www.hlayiso.com/grade-11/technical-mathematics/notes/analytical-geometry)
- [Exponents and surds](https://www.hlayiso.com/grade-11/technical-mathematics/notes/exponents-and-surds)
- [Logarithms](https://www.hlayiso.com/grade-11/technical-mathematics/notes/logarithms)
- [Equations and inequalities](https://www.hlayiso.com/grade-11/technical-mathematics/notes/equations-and-inequalities)
- [Nature of roots](https://www.hlayiso.com/grade-11/technical-mathematics/notes/nature-of-roots)
- [Euclidean geometry](https://www.hlayiso.com/grade-11/technical-mathematics/notes/euclidean-geometry)
- [Functions and graphs](https://www.hlayiso.com/grade-11/technical-mathematics/notes/functions-and-graphs)
- [Circles, angles and angular movement](https://www.hlayiso.com/grade-11/technical-mathematics/notes/circles-angles-and-angular-movement)
- [Finance, growth and decay](https://www.hlayiso.com/grade-11/technical-mathematics/notes/finance-growth-and-decay)
- [Mensuration](https://www.hlayiso.com/grade-11/technical-mathematics/notes/mensuration)

## Frequently asked questions

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

The Trigonometry section covers all key concepts from the Grade 11 Technical 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 Technical Mathematics exams.

### Are there quizzes for Trigonometry?

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

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