Tagged: measurement

Pizza maths


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This week in Maths we are continuing our study of area, looking at the area of circles. Earlier in the year we measured the diameter and circumference of many different-sized circles and found the relationship between those values. We found that the ratio between the diameter and the circumference of a circle is a little more than 3. Archimedes, the famous Greek mathematician, accurately determined the value of ‘pi’ over 200 BC. We use pi = 3.14 or 22/7 as an estimate for calculations, as the real value is a never-ending (irrational) number. This value can be used to calculate the area of a circle. Students calculated the area of small, medium and large pizzas and then we used the prices of different pizzas from our local restaurant to calculate the value of different sizes and toppings.

“What is pi?”

This week in year 7 maths we are looking at ‘pi’ – we started by drawing and measuring the radius and circumference of lots of circles around the school. We added all our results to a table, with columns for radius, diameter and circumference. Students quickly realized that the circumference of a circle was always a little bit more than three times the diameter of the circle. Next we will read about how Archimedes ‘discovered’ pi  – he determined the value of the ratio between the diameter and circumference very accurately over 200 years BC! We will also do an activity that shows how you can calculate the area of a circle and learn more about the famous mathematical symbol – pi.