3.7 Angles in Parallel Lines GCSE PowerPoint Lesson

This 35-slide lesson introduces angle relationships formed when a pair of parallel lines is crossed by a transversal. Students will learn to identify and use vertically opposite, corresponding, alternate, and co-interior angles to calculate unknown values. Through guided examples and reasoning tasks, students will explore how these angle rules help solve problems and justify angle facts, laying the foundation for more complex geometric reasoning.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Two structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential geometry concepts.