Pi Day is celebrated on March 14 dedicated to Pi (Greek letter π). The idea originated in the United States, where the convention is to write dates in a format that expresses March 14 as 3/14. These three digits match the value of pi up to two decimal places, at 3.14.
By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is also the area of a circle divided by the square of its radius. The ratio is always constant.
Pi is an irrational number, it is denoted by a symbol ‘π’.
Pi has its use in geometry, trigonometry, physics, astronomy and other sciences. It appears in various formulae. Few important formulae are:
