Pi, denoted by the Greek letter , is a mathematical constant representing the ratio of a circle’s circumference to its diameter. Imagine a circular pizza: Pi would be the ratio of its outer edge’s length to the length across its center.
Pi’s irrational, meaning it cannot be expressed as a simple fraction, and its decimal expansion never ends. Despite this, it plays a crucial role in many scientific and engineering disciplines. Its discovery and study have a rich history, notably the development of calculus by Isaac Newton and Gottfried Leibniz.