🔢 Mathematics · Geometry
Angles in triangles (age 10+)
Find unknown angles in triangles, quadrilaterals, and regular polygons using angle sum properties
Typical age: 10–11 years
“If your child knows that angles in a triangle always add up to 180°, and two angles in a triangle are 55° and 70°, can they work out the third angle without measuring it?”
0 / 3 mastered
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Needs first
- Types of angles (age 8+)REQUIRED
Finding unknown angles in polygons requires reading diagrams where known angles are marked with arcs and tick marks
- Classifying shapes by propertiesREQUIRED
Finding angles in polygons requires knowing shape properties
- Angle Sum RulesREQUIRED
Finding unknown angles builds on Y5 angle sum facts (180°, 360°)