Students realised that by squaring the circle’s radius, the resulting square ‘fits’ in the circle less than 4 times. Which number that we have been working with is somewhere less than 4 times? Well Pi of course or 3.14. From here students deduced that the formula for working out the area of the circle itself is the raduis x radius x pi…or pi.r(squared). In deriving the formula themselves students understand the area of a circle much deeper and can now try an estimating strategy to see if they get around the same answer!
Hayley, Atong, Marissa- designing and making a model car
Oceanne and Ruth- making a bike
Kaitlyn, Grace, Sienna- desiging and making a Wheel of furtune
Tony, Danny, Cameron- making a hamsten wheel
Nawaraj, Mohammad, Jacob, Cameron- making a car
Madi and lilli- wheelbarrow
Students have now used their understanding of pi, diameter of a circle and circumference to work out how to make a 1m long trundle wheel circle. Most groups have even devised a way to make the trundle wheel ‘click’ when it reaches 1 meter and surprisingly most wheels are pretty accurate- give or take a cm or 2 🙂
Most students have found the relationship between a circles diameter and its circumference. Therefore they have calculated that a meter circumference would have a diameter of about 31.8cm (by dividing 100 by pi). Now its time to make the circle bit of the trundle wheel out of cardboard. here are some pics….
if you are able to help out this Sunday at the Spring fair, kindly let us know.
Mr De Palma
Many students are noticing that the diameter ‘fits’ into the circumference of a circle 3 and a bit times. The challenge has been to work out what that ‘bit’ is as a ratio of the diameter.
Many students are getting around 3.14 which is Pi. Students are now expressing the relationship between the diameter and the circumference and pi with a formula so that they can begin constructing their trundle wheels.