Identifying the Parts of a Circle

Sheena Doria

This educational video provides a clear and visual introduction to the geometric terminology associated with circles. Guided by an animated teacher avatar, the lesson begins by connecting the concept of circles to everyday objects like clocks, pizzas, and wheels, helping students ground abstract math concepts in reality. The video systematically defines and illustrates key terms including center, chord, diameter, radius, circumference, and arc, using dynamic animations to show exactly where each part is located on a circle. The content moves beyond simple definitions by showing the relationships between these parts—demonstrating that a diameter is a specific type of chord and that a radius is half the length of a diameter. Color-coded visuals help distinguish between similar concepts, such as the difference between the circumference (the perimeter) and an arc (a portion of the perimeter). The pacing is deliberate, allowing students to process each new term before moving to the next. The video concludes with an interactive guided practice session where students apply their new knowledge to identify parts on a complex diagram. This formative assessment allows teachers to immediately check for understanding. The video is an excellent resource for introducing a geometry unit, reinforcing vocabulary, or reviewing concepts before a test, providing a comprehensive visual glossary for students.