The π (/Paque/) number is a mathematical constant. Originally defined as the relation of the circumference of a circle to its diameter, it now has several equivalent definitions and appears in many formulas in all areas of mathematics and physics. is roughly equal to 3.14159. It was represented by the Greek letter “π ” Since the mid-eighteenth century, although it is also sometimes written as “PI “. Also called Archimedes ‘ constant.

Being an irrational number, π cannot be expressed as a common fraction (equivalently, its decimal representation never ends and is never installed in a permanent repeat pattern). However, fractions like 22/7 and other rational numbers are commonly used to approximate π. Digits appear to be randomly distributed. In particular, the sequence of digits of π is conjectured to satisfy a specific type of statistical randomness, but to date, no evidence of this has been discovered. Also, π is a transcendental number; That is to say, it is not the root of any polynomial with rational coefficients. This transcendence of π implies that it is impossible to solve the old challenge of squaring the circle with a compass and a ruler.