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As a letter, pi has been around for around 3000 years; it has represented the following concept for just under 300. As a mathematical concept (the ratio of a circle's circumference to its diameter always being the same), pi has been used for around 4000 years.
The concept of PI was written about 3,912 years ago, because the earliest known textually evidenced approximations of PI date from around 1900 BC. They are found in the Egyptian Rhind Papyrus.
But only 306 years ago in 1706 AD William Jones was the first to use the Greek letter PI referring to the ratio of the perimeter to the diameter, which is constant for all circles.
The concept of PI was written about 3,912 years ago, because the earliest known textually evidenced approximations of PI date from around 1900 BC. They are found in the Egyptian Rhind Papyrus.
But only 306 years ago in 1706 AD William Jones was the first to use the Greek letter PI referring to the ratio of the perimeter to the diameter, which is constant for all circles.
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Related questions
Why was the number pi invented?
It was not invented it was discovered.
Who invented the word pi?
George VI created pi.
What is Pi and who invented or discovered Pi?
Pi is the relationship between the diameter and the circumference of a circle.
Who invented PI in math?
me
Which person invented pi?
It is unknown which specific person invented pi, but ancient Egyptians are the first group to have used it.
Who invented pi day?
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What year was pi invented?
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What famous mathematician discovered pi?
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Who invented Pi and why?
The name of the one who invented pi is hypotenuse. LOL! No-one "invented" the ratio known as pi, but establishing its original discoverer is another matter. As for "Hypotenuse" - "he" is the name for the longest side of a right-angled triangle. It was never anyone's name.
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