Circle Vocabulary A Journey into the World of Circles…

What is a Circle? A circle is defined as… The set of all points in a plane that are equidistant from a given point called the center point.

Basic Parts of a Circle Interior of a Circle Exterior of a Circle

. Center of a Circle It’s the point right in the center. Every point on a circle is exactly the same distance away from it.

Segments of a Circle Chord – a segment whose endpoints are on the circle

Segments of a Circle Diameter – a chord that passes through the center of the circle.

Segments of a Circle Radius – a segment that has the center as one endpoint and a point on the circle as the other endpoint. Don’t forget… A diameter is made up of two radii

Central Angles . A . . C An angle inside a circle where the vertex of the angle is the center of the circle. B <ABC is a central angle

Recap… Identify the following by their correct vocabulary name

Questions?