Arc Length – Edexcel IAL Pure 1 (Chapter 7.2) – Complete Lesson

A complete lesson on arc length using l = rθ, with θ in radians. A separate slide shows where the formula comes from, clearly marked as not examined. Six worked examples cover finding the arc, the radius and the angle, the perimeter of a sector, an angle given in degrees, and the perimeter of a segment using the cosine rule. Every question without a diagram starts with a sketch. Three practice slides, all with diagrams, include perimeters, a major arc, and exact answers in terms of π.

Fully animated PowerPoint lesson, ready to teach from or to use for revision. Every worked example is revealed one line at a time, and diagrams and graphs are drawn live, so students see each step as you explain it. Includes learning objectives, a starter, common mistakes, practice with answers, an exam-style question with a full M1/A1 mark scheme, and an exit ticket. All questions are original. Matches the Pearson Edexcel IAL Pure Mathematics 1 textbook. Watch me teach the lessons on YouTube: @mredinemaths.