A | B |

point | an exact location in space, represented by a dot |

ray | par of a line that starts with an endpoint and continues endlessly in one direction |

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

line | a straight, continuous and unending |

parallel lines | lines that do not intersect are always the same distance apart |

intersecting lines | lines that cross |

perpendicular lines | lines that meet or cross (intersect) forming right angles |

acute angle | 1-89 degrees |

obtuse angle | great than 90 degrees |

right angle | exaclty 90 degrees |

vertex | the middle point where the two sides of an angle meet |

right triangle | a triangle that has one 90 degree angle |

scalene triangle | a triangle that has no sides the same (congruent) |

isosceles triangle | a triangle with two congruent (same) sides |

pentagon | a polygon with 5 sides |

hexagon | a polygon with 6 sides |

heptagon | a polygon with 7 sides |

octagon | a polygon with 8 sides |

quadrilateral | a polygon with 4 sides |

triangle | a polygon with 3 sides |