Cosmos Pi-ku 2021 competition
March 14 is International Day of Mathematics – UNESCO declared it so at its 40
th General Conference in 2019 – and also Pi Day (that’s the constant pi, not pie) in the US (where March 14 is written in month/day format – 3.14).
International Day of Mathematics observance is led by the International Mathematical Union, whose theme in 2021 is Mathematics for a Better World.
There’s also a Pi Approximation Day, observed on 22 July (22/7 in day/month format), since the fraction
22⁄
7 is a common approximation of pi, accurate to two decimal places. And let’s not forget Two Pi Day, also known as Tau Day for the mathematical constant, observed on June 28 (6/28 in month/day format).