A | B |

right angle | A 90 degree angle. |

equilateral triangle | A triangle with all sides equal. |

scalene triangle | A triangle having three unequal sides and angles. |

vertex | The intersection point of two sides. |

right triangle | A triangle with one internal angle equal to 90 degrees. |

pentagon | A polygon with 5 sides and 5 angles. |

square | A rectangle having all four sides of equal length. |

intersecting lines | Lines that cross each other. |

perpendicular lines | Two lines that cross each other to form a 90 degree angle. |

acute angle | An angle less than 90 degrees. |

chord | The line segment between two points on a given curve. |

radius | A straight line extending from the center of a circle to the surface. |

line segment | One part of a line. |

Line | A continuous extent of length. |

point | A position in space. |

rectangle | A quadrilateral with opposite sides parallel. |

circle | A closed plane. |

closed curve | A curve that is continuous with meeting end points. |

hexagon | A six sided figure |

obtuse angle | An angle greater than 90 degrees. |