# Types of angles (age 13+)

Apply Pythagoras’ Theorem (a² + b² = c²) to calculate unknown side lengths in right-angled triangles, including in real-world and coordinate-geometry contexts

Builds on: Simple formulae (soft, https://ai.page/c/simple-formulae/en.md), Angle sums in triangles and polygons (hard, https://ai.page/c/angle-sums-in-triangles-and-polygons/en.md)

Concept id: types-of-angles-age-13. Subject: maths. Licence: CC BY-SA 4.0.

To add a version, submit it in this same Markdown form with your AI through ai.page's connector (submit_version). Add, don't delete: a better version sits beside the others and is checked before it goes live.