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# Geometry

### Unit 1

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

Angle | A figure created by two distinct rays that share a common endpoint. |

Angle of Rotation | The amount of rotation (in degrees) of a figure about a fixed point such as the origin. |

Bisector | A point, line or line segment that divides a segment or angle into two equal parts. |

Circle | The set of all points equidistant from a point in a plane. |

Congruent | Having the same size, shape and measure. |

Corresponding angles | Angles that have the same relative position in geometric figures. |

Corresponding Sides | Sides that have the same relative position in geometric figures. |

Endpoint | The point at each end of a line segment or at the beginning of a ray. |

Image | The result of a transformation. |

Intersection | The point at which two or more lines intersect or cross. |

Isometry | A distance preserving map of a geometric figure to another location using a reflection, rotation or translation. |

Line | One of the undefined terms of geometry that represents an infinite set of points with no thickness and its length continues in two opposite directions indefinitely. |

Line segment | A part of a line between two points on the line. |

Parallel lines | Two lines are parallel if they lie in the same plane and do not intersect. |

Perpendicular lines | Two lines are perpendicular if the intersect to form right angles. |

Point | One of the basic undefined terms of geometry that represents a location. A dot is used to symbolize it and it is thought of as having no length, width or thickness. |

Pre-image | A figure before a transformation has taken place. |

Ray | A part of a line that begins at a point and continues forever in one direction. |

Reflection | A transformation of a figure that creates a mirror image, "flips" over a line. |

Reflection line | A line that acts as a mirror so that corresponding points are the same distance from the mirror. |

Rotation | A transformation that turns a figure about a fixed point through a given angle and a given direction, such as 90* clockwise. |

Transformation | The mapping, or movement, of all points of a figure in a plane according to a common operation, such as translation, reflection or rotation. |

Translation | A transformation that slides each point of a figure the same distance in the same direction. |

Vertex | The location at which two lines, line segments or rays intersect. |

Created by:
eric.brock