If you were looking for an excuse or occasion to make pie, mathematicians have got one for you. On March 14, maths aficionados like myself celebrate Pi Day — the number that represents the ratio of a circle’s circumference to its diameter. Denoted by the Greek letter π, this peculiar number is generally referred to as approximately 3.14. Though in most cases its rounded-off version is used, in 2022 computers were able to calculate it to 100 trillion digits. This is why pi is perplexing: It is an irrational number, the sequence 3.14159265358979323846 … goes on for eternity without following a s…