Directions:

1. print this page

2. Fold the paper along the thick gray line

3. Look at one side, guess the answer, flip it over to check the answer

Parallel Lines | Lines in the same plane that do not intersect |

Perpendicular | Intersecting to form 90 degree angles, denoted by I_ |

Skew Lines | Lines that are not coplanar |

Adjacent Angles | Two angles in the same plane with a common vertex and a common size, but no common interior points |

Complementary Angles | Two angles whose measures have a sum of 90 |

Linear Pair | A pair of adjacent angles whose noncommon sides are opposite rays |

Supplementary Angles | Two angles whose measures have a sum of 90 |

Vertical Angles | The nonadjacent angles formed by two intersecting lines |

Area | The number of non-overlapping unit squares of a given size that exactly cover of a plane figure |

Formula | A mathematical relationship expressed with symbols |

Perimeter | The sum of the side lengths of a closed plane figure |