# Trigonometry basics

Use the trigonometric ratios sin, cos, and tan in right-angled triangles to find unknown sides and angles, including setting up the correct ratio for a given problem

Builds on: Types of angles (age 13+) (hard, https://ai.page/c/types-of-angles-age-13/en.md), Simple formulae (hard, https://ai.page/c/simple-formulae/en.md)

Concept id: trigonometry-basics. Subject: maths. Licence: CC BY-SA 4.0.

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