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# Unit 4 Vocabulary

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

Ray | A part of a line that has one endpoint and extends without end in one direction |

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

Line | A strait path that goes on forever in opposite directions |

Perpendicular | Lines, line segments, or rays are perpendicular if they form right angles |

Parallel | The same distance apart at every point |

Oblique | Not parallel or perpendicular |

Intersect | To cut or divide by passing through one another |

Portractor | A protractor is a tool that is used to measure angles in degrees |

Degree | A unit for measuring angles also a unit for measuring temperature |

Right Angle | An angle that measures 90 degrees |

Strait Angle | An angle that measures 180 degrees |

supplementary angles | angles having a sum of 180 degrees |

complementary angles | angles having a sum of 90 degrees |

opposite angles | the angles formed when two lines intersect |

vertical angles | pairs of opposite angles formed by intersecting lines |

Polygon | A closed plane figure with sides made of strait line segments |

Congruent | Exactly the same size and shape |

Isosceles Triangle | A triangle with at least two congruent sides |

Equilateral Triangle | A triangle with all equal sides |

Scalene Triangle | A triangle with no equal sides |

Acute Triangle | A triangle with three acute angles |

Obtuse Triangle | A triangle with one obtuse angle |

Right Triangle | A triangle with one right angle |

Right Trapezoid | A trapezoid with at least one right angle |

Circle | A plane figure that forms a closed path so that all the points on the path are the same distance from a point called the center |

Reflex Angle | An angle greater than 180 degrees |

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