The distance around a circle is called the circumference. It's mathematically represented by the formula C = 2πr, where "C" is the circumference and "r" is the radius of the circle. The value of π (pi) is approximately 3.14, and it represents the ratio of a circle's circumference to its diameter. The concept is integral in various fields, including geometry and engineering, as it helps in understanding circular shapes and designing structures. Knowing how to calculate circumference is useful in many practical applications, from measuring circular objects to designing wheels and tracks.