The distance around a circle is called the __________.

The distance around a circle is referred to as the circumference. This term specifically denotes the total length of the boundary that encloses the circle. It is calculated using the formula ( C = 2\pi r ) or ( C = \pi d ), where ( r ) is the radius and ( d ) is the diameter.

The diameter is the distance across the circle that passes through the center, whereas the radius is the distance from the center of the circle to any point on its circumference. While the term "perimeter" is more commonly associated with the total distance around polygons, in the context of circles, the appropriate and specific term is circumference. This distinction is important in applications related to circular measurements in fields such as electrical work and construction.