Ancient Babylonians and Egyptians discovered about 4,000 years ago that the ratio of a circle's circumference to its diameter (C/d) remained constant for all circles.
The number (pi) is a mathematical constant value roughly equal to 3.14159.
It's an irrational number. It means it can't be stated exactly as a ratio of two integers, despite the fact that fractions such 22/7 are frequently used to approximate it.
As a result, its decimal representation never ends or enters a pattern that repeats indefinitely.
For practical computations, ancient civilizations such as the Egyptians and Babylonians required reasonably accurate approximations of pi.
Archimedes, a Greek mathematician, devised an algorithm to approximate with arbitrary accuracy around 250 BC.
The Babylonians used 3.125 to approximate pi, a value they arrived at by calculating the perimeter of a hexagon encircled by a circle.
Assuming a 24/25 ratio between the hexagon's perimeter and the circumference of the circle.
According to the Rhind papyrus (about 1650 BCE), the Egyptians used a value of 256/81, or 3.16045.
Made a significant breakthrough by discovering a method for obtaining pi to any desired accuracy with enough patience.
Archimedes (c. 250 BCE)
Archimedes got, An average value of around 3.1418, by inscribing and circumscribing regular polygons around a circle to get upper and lower boundaries.
In the 1700s, mathematicians began to use the Greek letter (pi). The symbol was first used by William Jones in 1706 and it was popularised by Leonhard Euler in 1737.
Georges Buffon, a French mathematician from the eighteenth century, devised a method of calculating based on probability by dropping needles on a grid of parallel lines .
D. F. Ferguson, who calculated pi to 620 digits in 1945, had the most exact computation of pi before the computer.
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