Students use the circumference and area of a circle to solve a variety of problems with circular shapes. Throughout the lesson students develop their calculator and non-calculator techniques as solutions are presented in terms of pi or decimals rounded to three significant figures.

The start of the lesson recaps finding the circumference and area of a circle as a decimal and in terms of pi. The plenary challenges students students to calculate the perimeter and area of a circle and semi-circle.

**Differentiated Learning Objectives**

- All students should be able to solve problems involving the perimeter of circular shapes.
- Most students should be able to solve problems involving the perimeter and area of circular shapes.
- Some students should be able to set up and solve equations to model the area and perimeter of circular shapes.