A [b]circle[/b] is the set of all points in the plane that are the same distance away from a specific point, called the [b]center[/b].
Define tangent in your own words.
A line that intersects a circle in exactly one point.
Define secant in your own words.
A line that intersects a circle in two points.
Define chord.
A line segment whose endpoints are on a circle.
Define diameter.
A chord that passes through the center of the circle.
Define radius.
The distance from the center of the circle to its outer rim.
Define sector.
The part of a circle enclosed by two [url=https://www.mathopenref.com/radius.html]radii[/url] of a circle and their [url=https://www.mathopenref.com/arcintercepted.html]intercepted arc[/url]. A pie-shaped part of a circle.
Define arc.
An arc is any portion of the circumference of a [b]circle[/b].