# Pi Day

3/14 or March 14th, 2020 marks the Pi Day. However, the COVID-19 pandemic situation has limited celebrations across the world.

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#### Pi

Pi (22/7 or 3.14) is an important mathematical constant used in a wide range of calculations. It is given as the ratio of the circumference of any circle to its diameter. It is also given as the area of a circle divided by the square of its radius.

The idea for celebrating Pi Day was proposed by Larry Shaw, a physicist in Exploratorium Museum in San Francisco in 1988. The museum then launched the celebrations on March 14th at 1:59 (to correspond to 3.14159). March 14th is also the birth anniversary of Albert Einstein.

#### Tau Day

28th of June is observed as the Tau Day. 2π was proposed as an alternative for Pi as a circle constant by Bob Palais in 2001. This was named Tau and is approximately equal to 6.28. It is given by the ratio of a circle’s circumference to its radius.

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