7 terms

Circle

The set of all points in a plane that are a given distance from a given point

Radius

Segment (or length of the segment) from center of circle to the circle.

Diameter

The distance across a circle through the center. A diameter = 2(radii). The longest chord of a circle

Chord

A segment whose endpoints lie on a circle.

Secant

A line that contains a chord and intersects a circle in two points.

Tangent

A line that intersects a circle in exactly one point.

Point of tangency

The point that a tangent and a circle have in common.