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# More Circles

Question | Answer |
---|---|

Define: Chord | A segment whose endpoints lie on a circle. |

Define: Secant | A line that intersects a circle at two points. |

Define: Tangent | A line in the exact same plane as a circle that intersects it at exactly one point. |

Define: Point of Tangency | The point where the tangent and a circle intersect. |

Define: Congruent Circles | Circles that have congruent radii. |

Define: Concentric Circles | Coplanar circles with the same center. |

Define: Tangent Circles | Two coplanar circles that intersect at exactly one point. |

Define: Common Tangent | A line that is tangent to two circles |

A line that is tangent to a circle is ________ to the radius. | Perpendicular |

Define: Central Angle | An angle whose vertex is the center of a circle. |

Define: Arc | An unbroken part of a circle consisting of two points called the endpoints and all the points on the circle between them. |

Define: Minor Arc | An arc whose points are on or in the interior of a central angle. |

Define: Major Arc | An arc whose points are on or in the exterior of a central angle. |

Define: Semicircle | An arc that's endpoints lie on a diameter. |

Define: Adjacent Arcs | Arcs of the same circle that intersect at exactly one point. |

"In a circle | if a radius (or diameter) is perpendicular to a chord |

Define: Sector of a Circle | A region bounded by two radii of the circle and their intercepted arc. |

What is the equation for the area of a sector and/or segment? | A=πr^2 (m°/360°) |

Define: Segment of a Circle | A region bounded by an arc and its chord. |

Define: Arc Length | The distance along an arc measured in linear units. |

What is the equation for arc length? | L=2πr(m°/360°) |

Define: Inscribed Angle | An angle whose vertex is on a circle and whose sides contain chords of the circle. |

Define: Intercepted Arc | An arc consisting of endpoints that lie on the sides of an inscribed angle and all the points of the circle between them. |

Define: Secant Segment | A segment of a secant with at least one endpoint on the circle. |

Define: External Secant Segment | A secant segment that lies in the exterior of the circle with one endpoint on the circle. |

Define: Tangent Segment | A segment of a tangent with one endpoint on the circle. |

What is the equation of a circle? | (x-h)^2 + (y-k)^2 = r^2 |

Define: Radius | A line segment from the center of a circle to the circumference. |

Define: Diameter | A chord that contains the center of a circle. |

Created by:
Alison.Rector