A | B |

alternate exterior angles | Two angles that are formed by two lines and a transversal and lie outside the two lines on the opposite sides of the transversal. |

alternate interior angles | Two angles that are formed by two lines and a transversal and lie between the two lines on the opposite sides of the transversal. |

converse | The statement formed by switching the hypothesis and the conclusion of an if-then statement.. |

corresponding angles | Two angles that are formed by thwo lines and a transversal and occupy corresponding positions. |

image | The new figure that results from the transformation of a figure in a plane. |

line perpendicular to a plane | A line that intersects a plane in a point and is perpendicular to every line in the plane that intersects it. |

parallel lines | Two lines that lie in the same plane and do not intersect. |

parallel planes | Two planes that do not intersect. |

perpendicular lines | Two lines that intersect to form right angles. |

same-side interior angles | Two angles that are formed by two lines and a transversal and lie between the two lines on the same side of the transversal. |

skew lines | Two lines that do not lie in the same plane and do not intersect. |

transformation | An operation that maps or moves a figure onto an image. This can be a dilation, reflection, rotation or translation. |

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

transversal | A line that intersects two or more coplanar lines at different points. |