# Angles in triangles (age 10+)

Find unknown angles in triangles, quadrilaterals, and regular polygons using angle sum properties

Builds on: Types of angles (age 8+) (hard, https://ai.page/c/types-of-angles-age-8/en.md), Classifying shapes by properties (hard, https://ai.page/c/classifying-shapes-by-properties/en.md), Angle Sum Rules (hard, https://ai.page/c/angle-sum-rules/en.md)

Concept id: angles-in-triangles-age-10. Subject: maths. Licence: CC BY-SA 4.0.

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