Year 8 Mathematics / Properties of Geometrical Figures
Angles in Triangles and Quadrilaterals
Use the angle sum of triangles (180°) and quadrilaterals (360°), the exterior-angle theorem, and the properties of special quadrilaterals to find unknown angles.
Syllabus area
Measurement and Space
Focus
Build Stage 4 geometric fluency — angle relationships, parallel lines, polygon properties and introductory congruence — as the foundation for Year 9 geometric representations and Year 10 geometry proofs.
You can jump straight to the Mastery Quiz whenever you are ready.
Nova Maths