Most people first learn about the number π (pi) in school, usually when studying circles. It is often written as 3.14, but this is just an approximation. In reality, pi is an irrational number, ...
Celebrate Pi Day and read about how this number pops up across math and science on our special Pi Day page. For more than two millennia, mathematicians have produced a growing heap of pi equations in ...
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Pi Day 2026: From Rockets to Cancer Research, Here’s How the Number Pi Is Embedded in Our Lives
The holiday was created in 1988 by Larry Shaw, a physicist at the Exploratorium science museum in San Francisco.
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