2. GEOMETRYTopicPiHistorical NarrativeIn mathematics, Pi, is the ratio of the circumference of a circle to the diameter of the circle. The symbol used, , was created by British mathematician William Jones in 1706. (Gregersen 2019 ). Pi is an irrational number, its digits do not repeat, so an approximation is used for everyday calculations. The approximate value used is 3.14 or 22/7.