intersection | | the extent or amount of space between two things, points, lines, |

ray | | a rule that is accepted without proof |

endpoint | | sides that form two points of opposite rays |

coplanar | | all sides are congruent |

collinear | | a line that has only one endpoint |

postulate | | points that lie in the same plane |

coordinate | | all angles in the interior of the polygon are congruent |

distance | | coinciding at all points when superimposed |

congruent | | the opposite of convex |

segment | | having a surface that is curved or rounded outward. |

bisect | | a part cut off from a figure |

midpoint | | any of the magnitudes that serve to define the position of a point, or line |

angle | | points that lie on the same line |

vertex | | measures 180 degrees |

complementary angle | | a line that divides two point eaqualy |

supplementary angle | | measures 90 degrees |

adjacent angles | | two different rays with the same endpoints |

vertical angles | | a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end. |

polygon | | a point that ends a line |

convex | | a plane closed figure with |

concave | | a point of a segment that divides the segment into two congruent segments |

equilateral polygon | | a line that is half of the diameter |

equiangular polygon | | two angles that share a common vertex and side, but have no common interior points |

diameter | | a point or set of points common to two or more geometric configurations |

radius | | the endpoint of a side |