# Angles in triangles (age 12+)

Know and use the criteria for triangle congruence (SSS, SAS, ASA, RHS), use standard labelling conventions for sides and angles of triangle ABC, and determine whether two triangles are congruent

Builds on: Measuring angles (age 11+) (hard, https://ai.page/c/measuring-angles-age-11/en.md), Types of angles (age 11+) (hard, https://ai.page/c/types-of-angles-age-11/en.md)

Concept id: angles-in-triangles-age-12. Subject: maths. Licence: CC BY-SA 4.0.

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