Students explore the relationship between a circle's radius, diameter and circumference.

As learning progresses, they discover and apply the formula for the circumference of a circle.

**Differentiated Learning Objectives**

- All students should be able to derive and use the formulae for the circumference of a circle in terms of its diameter.
- Most students should be able to derive and use the formulae for the circumference of a circle in terms of its radius.
- Some students should be able to calculate the radius and diameter of a circle when given its circumference.