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# circle

### vocabulary

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 (point of tangency ) |

Circle | The set of all points in a plane at a given distance from a given point in the plane. |

Congruent Circles | Circles with the same radius. |

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 circles and whose sides contain chords of the circle. |

Central Angel | Angel whose vertex is the center of a circle and whose side contain radii of a 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 a less than the length of a semicircle of the circle. |

Major Arc | An arc of a circle whose length is greater than the length of a semicircle of the circle |