The ratio of a circle’s circumference to its diameter.
It’s decimal representation never ends or repeats.
Not the root of any non zero polynomial having rational coefficients.
Implies the impossibility of squaring the circle with a compass and straight edge.
The ubiquity of pi makes it one of the most widely known mathematical constants.
The ratio of the perimeter to the height of great pyramid at Giza is approximately 2 Pi.
Accuracy to 39 digits are sufficient to perform most cosmological calculations.
Its formulae are used in statistics, fractals, thermodynamics, mechanics, cosmology, number theory and electromagnetism.