angles in a triangle

Calculating Angles in a Triangle

Apply the properties of angles in a triangle to calculate unknown angles with this highly engaging maths lesson with differentiated self-marking activities.

Target Grade:

Lesson Overview

Calculating Angles in a Triangle

Apply the properties of angles in a triangle to calculate unknown angles with this highly engaging maths lesson with differentiated self-marking activities.
angles in a triangle
Description

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.

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.

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Last updated on: February 16, 2026

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