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The Long Island Museum - Today is National Pi Day, so called because it's March 14 or 3/14 or 3.14. The number π (pi) is a mathematical constant. Originally defined as the
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Happy Pi Day. Celebrate Pi Day. March 14th. 3.14 - Vector Stock Vector - Illustration of irrational, march: 141552808
![Para qué se usa el número Pi? (Y no es solo para calcular el perímetro o área de un círculo) - BBC News Mundo Para qué se usa el número Pi? (Y no es solo para calcular el perímetro o área de un círculo) - BBC News Mundo](http://c.files.bbci.co.uk/81AF/production/_100399133_gettyimages-925079932.jpg)