What do we call the segment that connects the center of a circle to its circumference?

The segment that connects the center of a circle to its circumference is known as the radius. This term specifically describes the distance from the center point of the circle to any point on its boundary. The radius is a fundamental concept in geometry, particularly when dealing with circles, as it helps to define the size of the circle.

In contrast, a chord is a segment that connects two points on the circumference, but does not necessarily pass through the center. The diameter is a special type of chord that passes through the center and is equal to twice the length of the radius. An arc refers to a part of the circumference of the circle, representing a portion of the circle's perimeter, rather than a line segment. Understanding these definitions is essential for working with circle-related problems in geometry.