Pi Approximation Day

July 22, or 22/7 for our European friends, is Pi Approximation Day. When a circle’s diameter is 1, its circumference is pi.

Archimedes (c. 287 BC – c. 212 BC) was a Greek jack-of-all-scientific-trades.  As a great mathematician, he worked out the very accurate approximation of Pi of 22/7.

Others later expressed pi in decimal form that never ends or repeats: 3.1415926535897932384626433832795…

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