3.44 Area of Any Triangle Trigonometry GCSE Higher PowerPoint Lesson

In this 22-slide lesson, students will learn how to calculate the area of any triangle using the formula ½absinC, reinforcing their understanding of trigonometry beyond right-angled triangles. They will explore how this method connects to the sine rule and cosine rule, deepening their ability to choose and apply the correct strategy when working with non-right-angled triangles. Through a variety of contextual and geometric problems, students will practise identifying given elements and using sine to find missing areas efficiently. This lesson consolidates prior knowledge of triangle rules while building confidence in multi-step problem solving using trigonometry.

Note this lesson is for the higher tier.

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.