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# Unit 7:Circles Vocab

### Vocabulary for Chapter 10 of Mc Dougal Littel Geometry Textbook.

Term | Definition |
---|---|

circle | The set of all points in a place that are equidistant form a given point called the center. |

center | Given point that has a set of all points equidistant from it. |

chord | A SEGMENT whose endpoints are on a circle. |

circumscribed circle | The circle that contains the vertices of an inscribed polygon. |

diameter | A CHORD that passes through the center of a circle. The distance across a circle through its center. |

arc | Part of the circumference(edge) of circle. |

external segment | The part of a secant segment that is OUTSIDE the circle. |

inscribed angle | An angle whose vertex is on a circle and whose sides contain chords of the circle. |

inscribed polygon | A polygon whose vertices all lie on a circle. |

intercepted arc | The arc that lies in the interior of an inscribed angle and has endpoints on the angle. |

secant segment | A segment that contains a chord of a circle and has exactly one endpoint out the circle. |

secant | A LINE that intersects a circle in TWO points. |

segments of a chord | When two chords intersect in the interior of a circle, each chord is divided into two segments called segments of the chord. |

semi circle | An arc with endpoint that are the endpoint of a diameter of a circle. The measure of a semicircle is 180 degrees. |

tangent | A line in the plane of a circle that intersect the circle in exactly ONE point, the point of tangency. |

radius | A segment whose endpoints are the center of the circle and a point on the circle. The distance from the center of a circle to any point on the circle. |

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