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circle vocabulary
definition of terms
| Term | Definition |
|---|---|
| Chord | A segment whose endpoints lie on a circle |
| Diameter | A chord that contains the center of a circle |
| Secant of a circle | A line that contains a chord |
| Tangent to a circle | A line that lies in the plane of a circle and that intersects the circle at exactly one point |
| Circle | The set of all points in a plane at a given distance from a given point in the plane |
| Radius | A segment from a point on a circle or a sphere to the center |
| Congruent circles | Circles with the same radius |
| Concentric circles | Circles that lie in the same plane that share the same center |
| Inscribed angle | Angle whose vertex lies on a circle and whose sides contain chords of the circle |
| Central Angle | Angle whose vertex is the center of a circle and whose sides contain radii of the circle |
| Circumference | Distance around a circle, that is, the perimeter of a circle |
| Arc length | A fraction of the circumference of a circle defined by the arc |
| Arc of a circle | Two points on a circle and the continuous part of the circle between the two points |
| Semicircle | An arc of a circle whose endpoints are the endpoints of a diameter |
| Minor arc | An arc of a circle whose length is less than the length of a semicircle of the circle |
| Major | An arc of a circle whose length is greater than the length of a semicircle of the circle |