# Right-angled Triangles

> This section solves a right-angled triangle in a 2D context with sin, cos and tan: SOH CAH TOA. From the two knowns and the unknown you choose the ratio, then find a side or an acute angle. Degrees…

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## Full notes

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## More in Trigonometry: Sine, Cosine and Area Rules

- [The Area Rule](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry-sine-cosine-and-area-rules/the-area-rule) — Next section
- [All Trigonometry: Sine, Cosine and Area Rules sections](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry-sine-cosine-and-area-rules)

## Frequently asked questions

### What will I learn in "Right-angled Triangles"?

This section covers Right-angled Triangles as part of Trigonometry: Sine, Cosine and Area Rules in Grade 12 Mathematics. You'll find clear explanations, worked examples, and key definitions aligned to the CAPS curriculum.

### Is this section aligned with the CAPS curriculum?

Yes. All notes on Hlayiso, including "Right-angled Triangles", are written against the official CAPS curriculum and ATP for Grade 12 Mathematics.

### What should I study after "Right-angled Triangles"?

Continue with the next section in Trigonometry: Sine, Cosine and Area Rules, or test your understanding with the interactive quiz linked to this section.

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