#### What is circumference?

This question is not easy to answer and even more complicated to understand. If you imagine any point on a flat surface and a series of points whose distance from that point is identical, then you are looking at a circle.

A circumference is the boundary of a circle, and its elements include:

**Radius**: The distance from the center of the circle to any point on the circumference.**Diameter**: A straight line passing through the center that connects two points on the circumference, equal to twice the radius.**Arc**: A portion of the circumference.**Chord**: A line segment connecting two points on the circle.**Tangent**: A line that touches the circle at exactly one point.