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# Geometry

### Lines and Angles

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

Line | a long, narrow mark or band |

Line segment | a line that is bounded by two distinct end points |

Ray | A line that starts at a point and goes off in a particular direction to infinity |

Right Angle | an angle measuring 90 degrees |

Acute Angle | an angle measuring less than 90 degrees |

Obtuse Angle | an angle measuring greater than 90 degrees |

Perpendicular Lines | Lines that intersect to make a right angle |

Parallel Lines | Two lines that are always the same distance apart and never touch |

Right Triangle | A triangle with exactly one right angle |

Equilateral Triangle | A triangle with all 3 interior angles measuring 60 degrees |

Line of Symmetry | a line across the figure such that the figure can be folded along the line into mirroring parts |

Adjacent | having a common vertex or side |

Congruent | equal |

Protractor | an instrument for measuring angles |

End point | a point or value that marks the end of a ray or one of the ends of a line segment or interval |

Square | A plane figure with two sets of parallel sides, that are all congruent, and four right angles |

Rectangle | A plane figure with two sets of parallel sides whose adjacent sides are not congruent and all right angles. |

Kite | A plane figure whose two sets of congruent sides are adjacent to each other |

Triangle | a plane figure with three straight sides and three angles |

Rhombus | a plane figure with four congruent sides, one set of congruent obtuse angles, and one set of congruent acute angles. |

Created by:
hollydolly21