International Pi (π) day is observed on _______ date ?

(a) 12^th March
(b) 14^th March
(c) 11^th March
(d) 15^th March

International Pi (π) day is observed on 14 March. The day was chosen as 3, 1, and 4, which are the first three significant digits of π. Pi is one of the most well-known mathematical constants. It is the ratio of a circle’s circumference to its diameter. It is represented by the lower-case Greek letter π.