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# Geo_5.1

### Vocabulary for Geometry_5.1

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

adjacent arcs | Arcs in a circle that have exactly one point in common. |

arc | A part of a circle that is defined by two endpoints. The measure of an arc is given in degrees. |

arc length | The distance between the endpoints along an arc measured in linear units. |

center (of circle) | The central point where radii form a locus of points called a circle. |

central angle | An angle that intersects a circle in two points and has its vertex at the center of the circle. |

chord | For a given circle, a segment with endpoints that are on the circle. |

circle | The locus of all points in a plane equidistant from a given point called the center of a circle. |

circumference | The distance around a circle. |

circumscribed | A circle circumscribed about a polygon if the circle contains all the vertices of the polygon. |

concentric circles | Coplanar circles with the same center. |

congruent arcs | Arcs in the same circle or in congruent circles that have the same measure. |

diameter | In a circle, a chord that passes through the center of the circle. |

inscribed | A polygon is inscribed in a circle if each of its vertices lie on a circle. |

major arc | An arc with a measure greater than 180. |

minor arc | An arc with a measure less than 180. |

pi (π) | An irrational number represented by the ratio of the circumference of a circle to the diameter of the circle. |

radius | In a circle, any segment with endpoints that are the center of the circle and a point on the circle. |

semicircle | An arc that measures 180. |