IB Math AI SL 3.4 - The Circle

IB Math AI SL 3.4 – The Circle introduces students to arc length and sector area through intuitive visuals and real-world contexts. Using familiar analogies, such as pizza slices and clock faces, the lesson builds a clear connection between central angles and proportional parts of a circle.

Students learn how to apply standard formulas for arc length and sector area, interpret problems geometrically, and reason about proportional change when angles vary. Guided examples and structured practice problems, such as circular rides and spotlight coverage, reinforce understanding and exam-style problem solving.

With its emphasis on visual reasoning, proportional thinking, and clear application (without requiring radians at SL), this slide deck equips students with essential geometry skills needed for IB assessment success.