Basically, Pi or π is the sixteenth letter of the Greek alphabet. It is a mathematical constant. It is also called Archimedes’ constant in many places. Now Pi is an important part of Mathematics and Physics. Because it is used in many formulas.

To understand Pi properly, we need to learn about circumference, perimeter, radius, diameter, and the area of a circle.

Pi is most commonly defined as the ratio of a circle’s circumference to its diameter. Also, Pi is an irrational number. In a simple word, the irrational number means, it cannot be written as a simple fraction. However, if we divide 22 by 7 (22/7) then the result will be very close to Pi. But it’s not the same number. Because Pi is an infinite decimal.

When it comes to mathematics or physics, it’s never been easy working with infinite decimals. That’s why mathematicians have to approximate Pi. In most cases, Pi is approximated as 3.14159 or 3.14.

#### There is a Pi Day too

Because Pi approximated as 3.14159 but some people shorten it to 3.14, that’s why Pi Day is celebrated on March 14 (03/14) since 2009.

Because Pi is an irrational number (numbers that never ends), so there is no final digit of Pi. And mathematicians have also proved that there is no recognizable pattern emerges in the succession of its digits. Although, Pi is calculated on by the computers over tree trillion digits.

#### So What is the Use of Pi in Real Life?

Pi is most commonly used in areas like mathematics, science, and nature. It helps make calculations quicker and faster. For scientists, Pi is useful for searching planets outside our solar system.

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