### Key Stage 3 Maths - Lesson Objectives, Keywords and Resources - Year 8 - Shape, Space and Measures

# Geometric proof

## Lesson Objectives

To be able to show that:

- The sum of the angles of a triangle is 180° and of a quadrilateral is 360°
- The exterior angle of a triangle is equal to the sum of the two interior opposite angles.

## Keywords:

triangle, quadrilateral, demonstrate, prove

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