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# Math 9.5 - 9.7 Vocab

### Vocab for 9.5 - 9.7 Course 1

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

Point | Usually labeled with an uppercase letter, such as A or B |

Line | Extends without end in two opposite directions |

Ray | Has one endpoint and extends without end in one direction. |

Segment | Has two endpoints |

Plane | A flat surface that extends without end in all directions |

Two different lines | Either intersect or are parallel |

Intersecting Lines | Meet at a point |

Parallel lines | Never meet |

Angle | Formed by two rays with the same endpoint |

Vertex | The angle; the point where two line segments meet. |

Degrees | Measurement of angles |

Right angle | An angle that measures 90 degrees |

Acute angle | An angle that measures below 90 degrees |

Obtuse angle | An angle that measures between 90 and 180 degrees |

Straight angle | An angle that measures exactly 180 degrees; looks like a straight line |

Vertical angles | Angles across from each other that have equal measures |

Complementary angles | two angles that add up to 90 degrees |

Supplementary angles | two angles that add up to 180 degrees |

Triangle | A closed plane figure with three straight sides that connect three points |

Acute triangle | has three acute angles |

Right triangle | has one right angle |

Obtuse triangle | has one obtuse angle |

Equilateral triangle | has three sides the same length |

Isosceles triangle | has at least two sides of the same length |

Scalene triangle | has three sides of different lengths |

Quadrilateral | A plane figure formed by 4 segments called sides |

Parallelogram | A quadrilateral with 2 pairs of parallel sides |

Rectangle | A parallelogram with 4 right angles |

Rhombus | A parallelogram with 4 sides of equal length |

Square | A parallelogram with 4 sides the same length and 4 right angles |

Polygon | closed figure that is formed by three or more segments called sides |

3 sides | Triangle |

4 sides | Quadrilateral |

5 sides | Pentagon |

6 sides | Hexagon |

8 sides | Octagon |

Regular Polygon | Polygon with equal side lengths and equal angle measures |

Diagonal | Connects two opposite angles of the polygon |

Congruent | Having the same shape and same size |

Similar | Having the same shape, but not necessarily the same size |

Corresponding parts | the matching sides and angles of two figures |

Line symmetry | if a line can be drawn that divides the figure in two congruent parts that are mirror images of each other |

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