# Angles in triangles (age 6+)

Distinguish defining attributes of shapes (e.g. triangles are closed and three-sided) from non-defining attributes (e.g. colour, orientation, overall size)

Builds on: 2-D shapes (hard, https://ai.page/c/2-d-shapes/en.md), 3-D shapes (age 5+) (hard, https://ai.page/c/3-d-shapes-age-5/en.md)

Concept id: angles-in-triangles-age-6. Subject: maths. Licence: CC BY-SA 4.0.

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