- Know and use the formulae for the area and circumference of a circle
Examples of what pupils should know and be able to do
- Secondary mathematics exemplification: Deduce and use formulae to calculate lengths, perimeters, areas and volumes
- What is the minimum information you need to be able to find the circumference and area of a circle?
- Give pupils some work that includes mistakes.
- Ask them to identify and correct the mistakes.
- How would you go about finding the area of a circle if you knew the circumference?
What if pupils find this a barrier?
Ensure that pupils understand that is the ratio of the length of the circumference of a circle to its diameter.
Demonstrate an approximation to the area by cutting a circle into 16 sectors and forming an approximation to a rectangle to establish a visual approximation to .
Ensure that is seen as .
Give pupils some work that includes mistakes and ask them to correct them. Be specific about common mistakes.