What is a central angle?

The video tutorial explains the concept of central angles in a circle, emphasizing their definition and properties. It highlights the importance of measuring central angles in radians, which is crucial for understanding the relationship between the angle, arc length, and radius. The tutorial provides a detailed explanation of how radians are used to measure angles, equating the central angle's measure to the arc length in terms of the circle's radius.

What is the significance of the radius when discussing radians?

Describe the concept of a central angle in relation to the vertex of a circle.