Google Doodle: What is Pi day?

Google Doodle: What is Pi day?

It's been calculated to more than 1 trillion digits beyond its decimal point, though it continues infinitely without repetition or pattern. Dubbed Pi Day, this comes right after Google recognised William Henry Perkins who had first discovered a synthetic purple coloured dye used in clothing and painting.

Google on Wednesday (March 14) dedicated its doodle to Pi, the mathematical consonant which represents the ratio between a circle's circumference and its diametre and is significantly used in geometrical calculations.

Pi (Greek letter "π") is the symbol used in mathematics to represent a constant, the ratio of the circumference of a circle to its diameter, which is approximately 3.14159.

Historically, the first Pi Day was held at a San Francisco Science Museum in 1988 when the physicist looked at the calendar and chose to pay homage to the mathematical entity.

The constant is crucial to find the area of a circle - with the equation A=πr². The Greek Mathematician Archimedes first approximated Pi as roughly 3.14.

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Pi can be called an irrational number, which continues to infinity.

Pi Day was first celebrated by physicist Larry Shaw at the Exploratorium in San Francisco nearly 30 years ago and incidentally in 2009, the United States House of Representatives voted in favour of designating 3/14 as Pi Day.

Many people have fun trying to remember the sequence of Pi, and the current world record belongs to Suresh Kumar Sharma from India.

How do people celebrate Pi Day?

Other than matching the first three digits of the value, it also happens to be Albert Einstein's birthday. "First recognized 30 years ago in 1988 by physicist Larry Shaw, Pi Day observers often celebrate with a slice of their favorite pie in honour of the number's delicious sounding name", Google wrote in its blog post.

The celebration was held at the San Francisco Exploratorium science museum.

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