March 17 , 2025
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- The date, when written as 3/14, mirrors the first three digits of Pi.
- Pi is an infinitely long, irrational number and its exact value cannot be known.
- Since Pi's exact value cannot be known, we can never find the exact area or the circumference of a circle.
- The symbol of Pi was discovered by William Jones in the year 1706.
- The value of Pi was first calculated by Mathematician, Archimedes of Syracuse.
- UNESCO started observing Pi Day as ‘International Day of Mathematics' from the year 2019.
- Pi Approximation Day is observed on July 22 (22/7 in the day/month format).

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