Home Pi Day 2021. On 14 March Pi Day is celebrated around the world. Pi is a symbol used in mathematics to represent a constant. It is the ratio of the circumference of a circle to its diameter which is approx. 3.14. Pi Day 2021. On 14 March Pi Day is celebrated around the world. Pi is a symbol used in mathematics to represent a constant. It is the ratio of the circumference of a circle to its diameter which is approx. 3.14. Author - Ambika Hanchate ,Writer space March 13, 2021 0 Facebook Twitter Whatsapp Newer Older
