3.30 Trigonometry Missing Side Lengths GCSE PowerPoint Lesson

In this 28-slide lesson, pupils will learn how to use trigonometric ratios — sine, cosine, and tangent — to calculate missing side lengths in right-angled triangles. The lesson begins with a recap of how to label the sides relative to the given angle and choose the correct ratio. Pupils will practise rearranging formulae and using calculators accurately. Worked examples and practice questions will build fluency and confidence. The lesson includes real-world applications and problem-solving to deepen understanding.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• One structured task to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential geometry concepts.