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# Geometry (Disbrow)

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

Reflect across x-axis (rule) | (x,-y) |

Reflect across y-axis (rule) | (-x,y) |

Reflect across y=x (rule) | (y,x) |

Rotate 90 degrees (rule) | (-y,x) |

Rotate 180 degrees (rule) | (-x,-y) |

What is a translation? (definition) | A transformation that shifts or slides every point of a figure in the same distance and direction. |

What is plane symmetry? (definition) | A three dimentional figure that can be divided into two conguent reflected halves by a plane. |

What is a vector? (definition) | A quantity that has both magnitude and direction. |

What is the Line of Symmetry? (definition) | A line that divides a plane figure into two congruent reflected halves. |

What does it mean when two or more points are "coplanar"? | The points lie on the same plane. |

What does it mean when two or more points are "collinear"? | The points lie on the same line. |

What is an undefined term? (definition) | Cannot be defined using other figures. |

What is a point? (definition) | An undefined term in Geometry; it has a location and has no size. |

What is a line? (definition) | An undefined term in Geometry; a line is a straight path that has no thickness and continues to an infinitive. |

What is a vertex? (definition) | The intersectionof two or more lines, segments, rays, or planes. |

What is a Segment? (definition) | A part of a line consisting of two endpoints and all points between them. |

What is a plane? (definition) | An undefined term in Geometry; a flat surface, no thickness, never-endng. |

What does it mean when you have "opposite rays"? (definition) | Two rays that have the same endpoint an form a line in opposite diections. |

How do you label a point? | Using Capital Letters. |

How do you label a line? | Using a lowercase cursive letter or two points. |

How do you label a vertex? | Using capital letters. |

How do you label a plane? | Using 3 points on the plane. |

How do you label a line segment? | Write the two endpoints with a bar above them. |

How do you label an endpoint? | Using capital letters. |

How do you label a ray? | Writing the endpoint and the other point on the ray. |

How do you label opposite rays? | Write the common endpoint, then the other point on the rays. |

Created by:
Neon__Shadow