What term describes the distance around a circle?

What term describes the distance around a circle?

• A. Circumference
• B. Diameter
• C. Radius
• D. Perimeter

Answer: (A)

The distance around a circle is called its circumference. This term specifically refers to the boundary length of a circle—what you’d measure if you walked all the way around the edge. Radius and diameter describe internal distances from the center to the edge or across the circle, not around the edge. Perimeter is a general term for the distance around any shape, but for circles the standard name for that around-the-edge distance is circumference. If you know the radius, you can relate them with the idea that circumference grows with the circle’s size, and you can compute it using the familiar relationship C = 2πr (or C = πd).

The distance around a circle is called its circumference. This term specifically refers to the boundary length of a circle—what you’d measure if you walked all the way around the edge. Radius and diameter describe internal distances from the center to the edge or across the circle, not around the edge. Perimeter is a general term for the distance around any shape, but for circles the standard name for that around-the-edge distance is circumference. If you know the radius, you can relate them with the idea that circumference grows with the circle’s size, and you can compute it using the familiar relationship C = 2πr (or C = πd).