I've been working with students, revisiting formulas for circumference and area of a circle. Applying these rules to problem-solving in various contexts, such as estimating the amount/cost of edging & topsoil needed to create a flower-bed in the shape of a semi-circle. Pi represents the fundamental relationship between circumference and diameter.
Pi is a fascinating number, approx 3, but better to use 3.14 or the value stored in your calculator, and it can be computed to millions of decimal places.
One bright lad asked, "So how do you calculate Pi?" This video shows a quick way of estimating pi using everyday circular objects. Tin, candle, saucepan etc are cylinders that have a circular cross-section whose diameter and circumference can easily be measured, to obtain an approximate value for pi. In another post I will explore some theoretical ways in which the value of pi is determined.
A little trick for remembering the first string of digits in pi:
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