Happy Pi Day 2017: Incredible facts about the enigmatic number that has fascinated mathematicians for generations

Pi Day is celebrated on March 14th (3.14 in the American calendar) around the world.

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.

The diameter of a circle is the distance from edge to edge, measuring straight through the centre. The circumference of a circle is the distance around.

Devised by Ancient Greek mathematician and general polymath Archimedes (287-212 BC), pi is an irrational number, meaning it continues infinitely without repetition or pattern.

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