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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 a plane of a circle and that intersects the circle at exactly one point (point of tangency) |

circle | a 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 lenth | 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 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 if a semicircle of the circle |