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# geometry

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

Line | a straight path of points that goes on in 2 direction |

Ray | part of a line. I has only one endpoint and extends forever in one direction |

parallel lines | never cross and stay the same distance apart |

perpendicular lines | are intersecting lines that form square corners |

point | an exact location in a space |

line segment | part of a line and has 2 endpoints |

plane | an endless flat surface |

angle | formed by two rays that have the same endpoint. |

acute angle | has a measure between 0˚ and 90˚ |

right angle | has a measure of 90˚ |

obtuse angle | Has a measure between 90˚ and 18˚ |

straight angle | Has a measure of 180˚ |

vertex | common endpoint |

protractor | to measure and draw angles |

degrees | What angles are measured in |

polygon | closed plane figure made up of line segments |

regular polygon | sides of equal length and angles of equal measure |

triangle | 3 sides ∆ |

quadrilateral | 4 sides |

pentagon | 5 sides |

hexagon | 6 sides |

octagon | 8 sides |

equilateral triangle | all sides are the same length |

isosceles triangle | Two sides are the same length |

scalene triangle | No sides are the same length |

right triangle | One angle is a right angle |

acute triangle | All three angles are acute angles |

obtuse triangle | one angle is an obtuse angle |

parallelogram | both pairs of opposite sides parallel and equal in length |

trapezoid | only one pair of parallel sides |

rectangle | a parallelogram with four right angles |

rhombus | a parallelogram with all sides the same length |

square | a rectangle with all ides the same length |

generalization | general statement |