# Measuring angles (age 9+)

Recognise angle measure as additive; find unknown angles by adding or subtracting on a diagram using equations with a symbol for the unknown

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

Concept id: measuring-angles-age-9. Subject: maths. Licence: CC BY-SA 4.0.

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