3.1 Introduction to Polygons GCSE PowerPoint Lesson

In this 28-slide lesson, pupils will be introduced to the key properties of polygons, focusing on regular and irregular shapes with up to 10 sides. Pupils will learn to distinguish between regular and irregular polygons by comparing side lengths and angles. The lesson also explores the different types of triangles (equilateral, isosceles, scalene, and right-angled) and quadrilaterals (square, rectangle, parallelogram, rhombus, trapezium, and kite), with an emphasis on their angle properties and side relationships. Pupils will also be introduced to the concepts of parallel and perpendicular lines within 2D shapes, helping them describe and classify polygons accurately. This lesson builds strong foundational knowledge for later work on angle calculations and geometric reasoning.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Three structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential geometry concepts.