Pi Day, which occurs every 14 March – or 3/14, in the US date format – celebrates the world’s favourite mathematical constant. This year, why not try an experiment to calculate its value?

But today, I am going to calculate pi with a numerical integral. What does that even mean? Let me start with an example—how do you find the area of a half-circle? The area of a circle is pi ...

What is the area of that circle? Surely everyone remembers that the area of a circle is: Where Pi (π) is of course the ... trick people used in the past to find the area under a curve on a ...