What term describes the distance around the perimeter of a circle?

The term that describes the distance around the perimeter of a circle is "circumference." This term is specifically used to denote the total length of the boundary line encircling the circle. The circumference can be calculated using the formula ( C = 2\pi r ) or ( C = \pi d ), where ( r ) is the radius (the distance from the center of the circle to any point on its edge) and ( d ) is the diameter (the distance across the circle through its center).

Understanding these geometric concepts is important, as they play a crucial role in various applications involving circles in both mathematics and real-world scenarios. The other terms, while related to circles, refer to different measurements: diameter is the measurement across the circle, area refers to the space contained within the circle, and radius pertains to the distance from the center to the edge. Hence, in the context of the question, "circumference" is clearly the correct term to describe the distance around the perimeter of a circle.