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# Unit 1 Vocabulary

### Unit 1 - Transformations Vocabulary

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

point | An undefined term; it names a location and has no size. |

line | An undefined term; A line is a straight path that has no thickness and extends forever. |

plane | An undefined term; it is a flat surface that has no thickness and extends forever. |

circle | The set of points in a plane that are a fixed distance from a given point called the center of the circle. |

angle | A figure formed by two rays with a common endpoint. |

perpendicular Line | Lines that intersect at 90° angles. |

parallel Line | Lines in the same plane that do no intersect. |

line segment | Part of a line that is bounded by two distinct endpoints. |

bisector | Cuts an object into two equal parts. |

congruent | Having the same size and shape, denoted by ≅ . |

corresponding angles | Angles in the same position in two different polygons that have the same number of angles. |

corresponding sides | Sides in the same position in two different polygons that have the same number of sides. |

endpoint | A point at an end of a segment or the starting point of a ray. |

intersection | A point at which two things intersect. |

ray | |

segment | |

vertex | |

angle of rotation | An angle formed by a rotating ray; called the terminal side, and a stationary reference ray, called the initial side. |

image | A shape that results from a transformation of a figure know as the pre-image. |

isometry | A transformation that does not change the size or shape of a figure. |

pre-image | The original figure in a transformation. |

reflection | |

line of reflection | |

rotation | |

transformation | |

translation | |

horizontal stretch | |

vertical stretch | |

symmetry | |

line symmetry | A figure that can be reflected across a line so that the image coincides with the pre-image. |

rotational symmetry | A figure that can be rotated about a point by an angle less than 360° so that the image coincides with the pre-image. |

order of rotational symmetry | The number of times a figure with rotational symmetry coincides with itself as it rotates 360°. |

vector | A quantity that has both magnitude and direction. |

dilation | A transformation that changes the size of a figure but not its shape. |

rigid transformations | A transformation that does not change the size or shape of a figure. |

isometric transformations | Transformations that don't change the size or shape of an object. Three types: Translations, Rotations, Reflections |

corresponding parts | Refers to the parts of two objects that are in the same relative position. |

coincide | To correspond exactly; to be identical. |

Created by:
AWarner