A | B |

line | a straight path that extends infinitely in both directions |

line segment | a part of a line that has two endpoints |

ray | a straight path that extends in one direction from its endpoint |

parallel lines | lines that never meet and are always the same distance apart |

parallelogram | a quadrilateral with two pairs of parallel sides |

right angle | a ninety degree angle |

angle | this is formed by two rays or line segments with a common endpoint |

acute angle | an angle that is less than ninety degrees |

obtuse angle | an angle that is more than ninety degrees |

hexagon | a six sided polygon |

pentagon | a five sided polygon |

octagon | an eight sided polygon |

endpoint | a point at the end of a ray or line segment |

intersecting lines | lines that cross at a point |

rectangle | a parallelogram with four right angles |

square | a parallelogram, rectangle, rhombus, and quadrilateral |

rhombus | a parallelogram with four congruent sides |

triangle | a three sided polygon |

polygon | a closed figure made up of line segments |

trapezoid | a quadrilateral that has exactly one pair of parallel sides |