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# Circle Vocab

### Defenition 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 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 |

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

Central Angle | Angles whose vertex is the center of a circle and whose sides contain radii of the circle |