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# Unit 11

### Geometric Constructions

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

angle | A figure formed by two line segments or rays with a common endpoint. |

vertex | A common endpoint of two or more line segments or rays. |

right angle | An angle that measures exactly 90 degrees. |

acute angle | An angle that measures greater than zero degrees and less than 90 degrees. |

obtuse angle | An angle that measures greater than 90 degrees but less than 180 degrees. |

straight angle | An angle that measures exactly 180 degrees. |

degree | The measurement of an angle. |

complementary angles | Two angles whose measures have the sum of 90° |

supplementary angles | Two angles whose measures have the sum of 180°. |

adjacent angles | Angles that have a common vertex and a common side, but no common interior points. |

parallel lines | Lines in the same plane that never intersect and remain the same distance apart from each other. |

intersecting lines | Lines that have one or more points in common. |

perpendicular lines | Two lines that meet at a point and form right angles (90°) to each other. |

vertical angles | The opposite angles formed by two intersecting lines. Vertical angles have the same measure and therefore are congruent. |

plane | A flat, two-dimensional surface. |

transversal | A line that intersects two or more lines. |

triangle | A polygon with three sides and three angles. |

triangulating | Dividing a polygon into triangles without introducing any new vertices. |

construct | To form by assembling or combining parts; build. |

side length | The measure of a line segment forming part of the perimeter of a plane geometric figure. |

protractor | An instrument used to measure angles. |