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# Geometry Words

### words for Chapter 8 Test

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

Point | A location in space |

Line | A straight path that continues in two directions without ending |

Line segment | A straight path that has two endpoints. |

Ray | A straight path that starts at one endpoint and continues in one direction without end. |

Angle | Figure made by two rays with a common endpoint. |

Vertex | The center point of an angle |

Protractor | A tool used to measure the degrees of angles |

Acute | An angle that is less than 90 degrees |

Obtuse | An angle that is more than 90 degrees |

Right | An angle that is exactly 90 degrees, a square corner |

Vertical angles | Angles that are opposite of each other, they are also congruent |

Congruent | Having the same size and shape or measurement |

Adjacent angles | Angles that share a common side or ray |

Supplementary angles | angles that add to 180 degrees together |

Complementary angles | Angles that add to 90 degrees together |

Skew lines | Lines in different planes that never cross |

Intersecting lines | Lines that cross at one point |

Parallel lines | Lines in the same plane that never cross |

Perpendicular lines | Lines that cross at 90 degree angles |

Equilateral triangle | A triangle with 3 equal sides |

Scalene triangle | A triangle with 0 equal sides |

Isosceles triangle | A triangle with exactly 2 equal sides |

Rhombus | A quadrilateral with 4 equal sides |

Square | A quadrilateral with 4 equal sides and 4 right angles |

Trapezoid | A quadrilateral with exactly 2 parallel sides |

Rectangle | A quadrilateral with two pairs of parallel sides and 4 right angles |

Parallelogram | A quadrilateral with two pairs of parallel sides |

Quadrilateral | A polygon with 4 sides |

Triangle | A polygon with 3 sides |

Pentagon | A polygon with 5 sides |

Hexagon | A polygon with 6 sides |

Octagon | A polygon with 8 sides |

Polygon | A simple, closed, plane figure with at 3 or more straight sides |

Translation | A movement of a figure along a straight line |

Rotation | A movement of a figure around a point |

Reflection | A movement of a figure in which the figure is “flipped” - the location and position changes |

Line of symmetry | The line on a figure which divides the figure so that the two parts are “mirror” images of each other. If folded on this, both parts will match exactly. |

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

Geometry | The study of “Earth Measurement” involving shapes, angles, points, lines |

Circle | a set of all points in a plane that are equal distance from a point called the center |

Created by:
lseman