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# Geometry-8th Grade

### Vocabulary

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

Point | An exact position in space |

Line | An infinite set of points forming a straight path in two directions |

Line Segment | A part of a line defined by two end points |

Ray | A part of a line that has one endpoint and extends indefinitely in one direction |

Plane | A flat surface that extends indefinitely in all directions |

Angle | Two rays that share an end |

Right Angle | An angle that measures exactly 90 degrees |

Acute Angle | An angle with a measure of less than 90 degrees |

Obtuse Angle | An angle with a measure of more than 90 degrees |

Straight Angle | An angle with a measure of exactly 180 degrees |

Reflex Angle | An angle that measures more than 180 degrees |

Vertex | The point at which two line segments, lines, or rays meet to form an angle |

Congruent | Having the exact same shape and size |

Parallel Lines | Always the same distance apart. They never intersect. |

Perpendicular Lines | Two lines forming right angles |

Complimentary Angles | 2 angles that add up to 90 degrees |

Rectangle | Quadrilateral with 2 pairs of opposite sides parallel and congruent and 4 right angles |

Adjacent Angles | Angles that are next to each other (share a vertex and a side between them) |

Vertical Lines | Opposite angles formed by intersecting lines |

Rhombus | Quadrilateral with 2 pairs of opposite sides parallel and all sides equal |

Isoosceles | Triangle with 2 sides equal |

Equilateral | Triangle with all sides equal |

Quadrilateral | 4-sided shape |

Alternate Exterior Angles | Angles on opposite sides of the transversal and outside the parallel lines |

Hexagon | 6-sided shape |

Octagon | 8-sided shape |

Alternate Interior Angles | Angles on opposite sides of the transversal and inside the parallel lines |

Supplementary Angles | 2 angles that add up toe 180 degees |

Pentagon | 5-sided shape |

Decagon | 10-sided shape |

Vertex | The point where an angle is formed |

Parallelogram | Quadrilateral with 2 pairs of opposite sides parallel |

Scalene | Triangle with no sides equal |

Corresponding Angles | "Matching Angles" In the same location on a different line |

Trapezoid | Quadrilateral with 1 pair of opposite sides parallel |

Square | Quadrilateral with 2 pairs of opposite sides parallel all sides congruent, and 4 right angles |

Created by:
smuehleisen