Pi (π) in mathematics is represented as the fraction 22/7. Although 22/7 is a well-known rational approximation of π, it should be noted that pi itself is an irrational number, meaning it cannot be exactly expressed as a simple fraction. The value of π represents the ratio of the circumference of a circle to its diameter and is approximately equal to 3.14159. This mathematical constant is fundamental in geometry, trigonometry, and many branches of mathematics and physics, appearing in formulas involving circles, waves, and oscillations, among other applications.