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# Circles Lines Angles

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 straight 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 | Lines that are not parallel or perpendicular. |

Intersect | To cut or divide by passing through or across. |

Protractor | A tool used to measure angles. |

Degree | A Unit of measuring angles.Also a unit for measuring angles. |

Right Angle | An angle that measures 90 degrees. |

Straight Angle | An angle of 180 degrees. |

Sumpplementary Angles | Angles having a sum of 108 degrees. |

Complementary Angles | Angles having a sum of 90 degrees. |

Opposite Angle | When two angles intersect. |

Vertical Angle | Pairs of opposite angles formed by intersecting lines. |

Opposite Angles | When two lines intersect. |

Vertical Angle | Pairs of opposite angles formed by intersecting lines. |

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

Congruent | Exactly the same size and shape. |

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

Equilateral | Having 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. |

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