Texas Instruments
Texas Instruments: Relationship of Angles to the Circle
In this activity, young scholars recognize the relationship of angles to circles. They study the Inscribed Angle Theorem and its corollaries.
Geometry Help
Geometry Help: Arcs, Angles, and Sectors
Explains the basic concept of arcs, angles, and sectors with step-by-step instructions and methods for solving specific problems on your own relating to this topic.