Circles: Radius, Diameter, Chords, Circumference, and Sectors

The video tutorial introduces circles, explaining their basic properties, such as the center and radius. It discusses line segments like radius, chords, and diameter, and explains arcs and circumference. The concept of pi is introduced, along with equations for calculating circle dimensions. The tutorial also covers circle sectors and angles, providing a comprehensive overview of circle geometry.

Describe what a sector of a circle is.

How do the angles of all sectors in a circle relate to each other?