The term for the distance around a circle is called the circumference. This measurement is calculated using the formula C = 2πr, where "C" represents the circumference, "r" is the radius, and "π" (pi) is a mathematical constant approximately equal to 3.14159. The circumference of a circle is important in various fields, including mathematics, engineering, and physics, as it describes the total perimeter of the circular shape. Understanding the relationship between the radius and circumference is crucial for problem-solving in both theoretical and practical contexts.