By dividing the diameter of a circle into its circumference which is about 22/7 but the true value of pi is not known as a decimal because its decimal places can go on to infinity.
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Pi.
It's basically 22/7 as a fraction
It was a cool looking greek letter.
mathalets from the 3rd century in 130 ad from babylonian discovered that pi equals 3.14567789870989977890.....
Study of circles. It was derived by mathematicians(Greek?) who developed an infinite series to describe it.