**Pi Approximation Day is observed every year on July 22 all around the world because the value of Pi is denoted by the fraction 22/7, and in the fraction 22/7 which denoted Pi, the numerator 22 symbolizes the date (22nd day of the month) and numerator 7 indicates the month (July).**

## Some interesting facts about** π**

- It is a mathematical constant
- It is defined as the ratio of a circle’s circumference to its diameter
- It is approximately equal to 3.14159.
- Its commonly used approximate fraction is 22/7
- Its decimal representation never ends and never settles into a permanently repeating pattern
- It is known as a transcendental number

- Its first 31 digits have no zero, however at position 763 there are six nines in a row, and this is also known as Feynman Point
- It is irrational, was proved by Johann Lambert in 1768
- It is symbolized by
**π**, which was introduced by the Welsh mathematician William Jones in 1706, and has been used regularly in its mathematical sense ever since - It is an irrational number and it cannot be expressed as a ratio of whole numbers
- It is the never-ending and never-repeating number
- It is also called as the “circular constant”, “Ludolph’s number”, or “Archimedes’ constant”
- It was also proved by
**Archimedes**that the ratio of the area of a circle to the square of its radius is the same constant

- Its 31,415,926,535,897 decimal places were calculated by the computers in the early
**21st century**and also its two-quadrillionth digit when expressed in binary (0) - It is used in several mathematical problems consisting of the lengths of arcs or other surfaces like the areas of ellipses, sectors, and other curved surfaces, and the volumes of various solids
- It is also used in several formulas of physics and engineering to describe such periodic phenomena as the motion of pendulums, the vibrations of strings, and alternating electric currents

**Here are some more activities one can do to celebrate Pi Day: **Link 1; Link 2

A very informative and detailed explanation regarding value of PI ,history and background adds more knowledge about pi.

Thanks.

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