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Nobody knows exactly who discovered pi. Around 2000 B.C. is the dawn of the documented history of mathematics. From the documents it is evident that by then the Babylonians and the Egyptians (at least) were aware of the existence and significance of the constant π. But the Babylonians and the Egyptians knew more about π than its mere existence. They had also found the approximate value. By about 2000 B.C., the Babylonians had arrived at the vale π=¾ and the Egyptians at the value π = 4(8/9)². They were only able to approximate pi, however.
In the 3rd century B.C., Archimedes of Syracuse came up with the first method to calculate π to any desired accuracy.
For the origin of the name:
The Greek letter π, often spelled out pi in text, was adopted for the number from the Greek word for perimeter "περίμετρος", first by William Jones in 1707, and popularized by Leonhard Euler in 1737.
Also, Bill just copied and pasted the part about Pi's history from Wikipedia.
In the 3rd century B.C., Archimedes of Syracuse came up with the first method to calculate π to any desired accuracy.
For the origin of the name:
The Greek letter π, often spelled out pi in text, was adopted for the number from the Greek word for perimeter "περίμετρος", first by William Jones in 1707, and popularized by Leonhard Euler in 1737.
Also, Bill just copied and pasted the part about Pi's history from Wikipedia.
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There's no definite answer to this, since it's been thousands of years since mathematical applications involving pi were first used, but it's considered that the Babylonians, Egyptians, Jews, and Hindus were the first mathematicians who used them.
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Some good info at the link below.