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Learn about the number pi , why it is important in math, and what it is used to calculate! What is Pi in Math? The Pi Symbol One Million Digits of Pi … Pi Day March 14 (3/14) is celebrated worldwide as Pi Day , coinciding with Einstein's birthday. Pi Day is an annual event on March 14 to honor the mathematical constant & pi ;, which is often approximated by 3.14. Learn about the origin, traditions and variations of Pi Day , such as Pi Approximation Day and Tau Day , from this Wikipedia article.
