The first story introduces the characters - Sir Cumference, Lady Di Ameter and their son Radius - and the story shows how they relate to the circle. The girls understood this with ease and loved the way the story flowed. In the second book a tragedy unfolds and Radius has to work out Pi to rescue his father - this seemed abit harder to grasp so we set about creating notebook pages to reinforce the concept.
First they drew 3 circles with the compasses and labelled the diameter, radius and circumference.
Next they moved onto Pi. We started with a big circle and they had to cut a length of ribbon for the diameter.
they measured 3 lengths (using the diameter as a guide) and stuck them around the circumference of the circle
and finally write up an explanation.
I just love DD8's comments - 'notice Greek!' and 'diameter goes from the top to bottom (not the rude bottom)' - really made me chuckle.