# Understanding angles (age 9+)

Use the properties of rectangles to deduce related facts and find missing lengths and angles

Builds on: Estimating answers (age 9+) (soft, https://ai.page/c/estimating-answers-age-9/en.md), Understanding angles (age 8+) (hard, https://ai.page/c/understanding-angles-age-8/en.md)

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

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