# Properties of triangles and quadrilaterals

Derive and illustrate properties of triangles, quadrilaterals, and circles using appropriate language, including interior angles, diagonals, symmetry, and relationships between side lengths

Builds on: Classifying shapes by properties (hard, https://ai.page/c/classifying-shapes-by-properties/en.md), Types of angles (age 11+) (hard, https://ai.page/c/types-of-angles-age-11/en.md)

Concept id: properties-of-triangles-and-quadrilaterals. Subject: maths. Licence: CC BY-SA 4.0.

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