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# Geometry Chap. 10

### Vocabulary

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

Area of a Parallelogram (Theorem 10-1) | The product of a base and the corresponding height. |

Area of a Rectangle (Theorem 10-2) | The product of its base and height. |

Area of a Triangle (Theorem 10-3) | Half the product of a base and the corresponding height |

Base of a parallelogram | Any one of its sides. |

Altitude of a parallelogram | A segment perpendicular to the line containing the base, drawn from the side opposite the base. |

Height of a parallelogram | The length of an altitude. |

Base of a triangle | Any one of its sides. |

Height of a triangle | The length of the altitude to the line containing that base. |

Height of a trapezoid | The perpendicular distance between the bases. |

Radius of a regular parallelogram | The distance from the center to a vertex. |

Apothem | The perpendicular distance from the center to a side. |

Circle | In a plane, a circle is the set of all points equidistant from a given point called the center. |

Center | The middle point of a circle or sphere, equidistant from every point on the circumference or surface. |

Diameter | A segment that contains the center of a circle and has both endpoints on the circle. |

Radius | A segment that has one endpoint at the center and the other endpoint on the circle. |

Congruent Circles | Have congruent radii |

Central Angle | an angle whose vertex is the center of the circle. |

Semicircle | Half of a circle |

Minor arc | Smaller than a semicircle |

Major arc | Larger than a semicircle |

Adjacent arcs | Arcs of the same circle that have exactly one point in common. |

Circumference | The distance around the circle. |

Pi | The ratio of the circumference of a circle to its diameter. |

Concentric Circles | Coplaner circles that have the same center. |

Arc Length | A fraction of the circumference. |

Sector of a circle | A region bounded by an arc of the circle and the two radii to the arc's endpoints. |

Segment of a circle | A part of a circle bounded by an arc and the segment joining its endpoints. |

Geometric probability | Points on a segment or in a region of a plane represent outcomes. The geometric probability of an event is a ratio that involves geometric measures such as length or area. |