Calculating Angles in a Triangle

★★★★★ 5.0 • Year 6 Maths • 🎓 Interactive Lesson & Activities

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By the end of this unit, students will be able to:

learn that the interior angles of a triangle add up to 180 degrees;
use this rule to work out unknown angles in a triangle.

Curriculum Alignment: Year 6 Geometry: Properties of shapes

Compare and classify geometric shapes based on their properties and sizes and find unknown angles in any triangles, quadrilaterals, and regular polygons.

Year Group	Year 6 Maths
Resource Type	🎓 Interactive Lesson & Activities
Format	Digital Only
Curriculum	England & Wales — KS2 (Years 3–6)
Added	4 March 2026