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**Source**-This post on **March 14-Pi day** is based on the article “**Pi Day: Behind the world’s most famous mathematical constant**” published in “**The Indian Express**” on 14th March 2024.

## Why in the News?

March 14 is celebrated worldwide as Pi Day, commemorating the well-known approximation (3.14) of the mathematical constant Pi. On Pi Day, mathematicians raise awareness about their field through lectures, museum exhibits, and pie-eating contests

## Why March 14?

**1.** The value of Pi is approximately 3.14 or expressed as the fraction 22/7.

**2.** When the date is written in the month/day format (3/14), it corresponds to the first three digits of this mathematical constant.

**History of its celebration**

**1.** Physicist Larry Shaw marked the first Pi Day celebration in 1988 at the San Francisco Exploratorium.

**2.** In 2009, The U.S. House of Representatives designates March 14 (3/14) as National Pi Day.

**3.** In 2019, UNESCO’s 40th General Conference officially recognized Pi Day as the International Day of Mathematics.

## What is Pi (π)?

**1.** Pi, often denoted by the Greek letter π, is a well-known mathematical constant.

**2.** It signifies the ratio of a circle’s circumference to its diameter, which remains constant regardless of the circle’s size.

**3.** Pi is an irrational number, meaning it has an infinite decimal expansion without any repeating pattern.

## Discovery of Pi

**1.** Pi has been known for nearly 4,000 years and was discovered by the ancient Babylonians and ancient Egyptians.

**2.** Greek mathematician Archimedes of Syracuse (287 B.C. to 212 B.C.) was among the earliest to calculate pi.

**3.** The mathematical constant pi is represented by the symbol ‘π,’ which was created by British mathematician William Jones in 1706.

**Applications**: Pi finds utility in a broad array of mathematical and scientific computations, encompassing fields such as geometry, trigonometry, calculus, and beyond.

**UPSC Syllabus- Miscellaneous**