Step 8 Objective
Know and use the formulae for the area and circumference of a circle.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
What if pupils find this a barrier?
Ensure that pupils understand that π 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 πr².
Ensure that πr² is seen as π × r × r.
Give pupils some work that includes mistakes and ask them to correct them. Be specific about common mistakes.