Published: Wed, March 14, 2018
IT&Software | By Alfonso Woods

Google marks 30 years of Pi mathematical symbol with a formula doodle

Google marks 30 years of Pi mathematical symbol with a formula doodle

Today, Google homepages across the world are featuring something delectable and irrational at the same time.

Google on Wednesday celebrated the 30th anniversary of the mathematical constant Pi, a fundamental element of several mathematical fields, with a doodle of actual pies.

March 14 is celebrated as Pi Day when the date lines up in the numbers of the famous constant. It's an annual celebration of the mathematical constant, π. Other than matching the first three digits of the value, it also happens to be Albert Einstein's birthday. On Pi Day's 30th anniversary, Google has honoured the day by creating a pie-themed doodle as the number has a delicious sounding name.

Mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately "22/7". With people all over celebrating today, NASA too has invited the public to celebrate Pi Day (March 14) by organising a "Pi in the Sky" challenge.

According to, Pi has been calculated to over one trillion digits beyond its decimal point. Mathematicians adopted the symbol π for the expression in the 18th century: Welsh mathematics teacher William Jones is often credited with the first use of the symbol in 1706. This involves the calculation of Martian earthquakes, the helium rain on Jupiter and the rotation rate of asteroids and even the solar eclipse. To celebrate the once-a-year occasion, Google is treating users with a look at a salted caramel apple pie recipe by baker Dominique Ansel, aka the inventor of the cronut.

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