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Pi Day is noticed yearly on March 14, marking the significance of the mathematical constant π (pi). The day is commemorated by arithmetic fanatics round the world in recognition of the topic’s enduring legacy.
March 14 is chosen as a result of the first three digits of π — 3.14159 — match the date 3/14.
What is Pi?
Pi is the ratio of the circumference of a circle to its diameter. Its first three and most generally recognised digits are 3.14. The constant is used to calculate the space and quantity of round and spherical objects. Represented by the Greek letter π, it’s an irrational quantity utilized in a number of formulae throughout arithmetic and physics.
History and significance of Pi
Over the centuries, a number of mathematicians tried to calculate the worth of pi utilizing completely different strategies, together with a number of distinguished mathematicians like Archimedes. The Greek letter π was launched by Welsh mathematician William Jones in 1706 to symbolize the ratio of a circle’s circumference to its diameter. The letter was chosen because it corresponds to the Greek phrases for “periphery” and “perimeter,” and pi is the ratio of a circle’s periphery, or circumference, to its diameter.
Pi Day was first noticed in 1988 by American physicist Larry Shaw at the San Francisco Exploratorium. The day gained wider recognition in the United States after the U.S. House of Representatives handed a non‑binding decision on March 12, 2009, recognising March 14 as National Pi Day. The date additionally coincides with the start anniversary of physicist Albert Einstein.
A well-liked custom related to the day entails consuming pie, as the phrases “pi” and “pie” are homophones. Since pies are usually round, the dish is seen as a symbolic strategy to mark the event.
International Mathematics Day
March 14 can also be noticed worldwide as International Mathematics Day. The day was formally proclaimed by the United Nations Educational, Scientific and Cultural Organization (UNESCO) throughout its fortieth General Conference in November 2019, following a proposal supported by the worldwide arithmetic neighborhood.
The day seeks to lift public consciousness of the position arithmetic performs in addressing actual‑world challenges and in supporting scientific and technological improvement.
By selecting March 14, UNESCO expanded current Pi Day celebration right into a broader world recognition of arithmetic and its functions.
Theme for 2026
Each yr, the International Mathematics Day is widely known with a theme highlighting a selected side of the self-discipline. The theme for International Mathematics Day 2026 is “Mathematics and hope.”
The theme highlights the concept that arithmetic, like hope, is one of humanity’s most common property, in response to UNESCO. “Mathematics enables a deeper understanding of reality, supports the development of shared frameworks and definitions, and strengthens collaboration across disciplines and societies. Through responsible use of data and rigorous reasoning, mathematics contributes to solutions that serve the common good,” UNESCO mentioned in an announcement.
The organisation additional mentioned that arithmetic helps societies navigate uncertainty, construct belief in information, and envision extra inclusive and sustainable futures. Beyond advancing scientific and technological progress, it additionally performs a job in strengthening social cohesion and resilience
Google Doodle for Pi Day
To mark Pi Day, Google launched an interactive and vibrant Doodle highlighting the significance of the mathematical constant.
“This Doodle celebrates the numerical constant pi (π), highlighting the foundational geometry first used to calculate its limits. Long before modern technology, the Greek mathematician Archimedes popularized an innovative approach: he approximated the value of pi by sandwiching a circle between two 96-sided polygons to determine its precise upper and lower bounds. Today, we honor this mathematical legacy as enthusiasts worldwide celebrate with pi-reciting contests and slices of pie,” the Doodle states.
Published – March 14, 2026 09:08 am IST