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# Topic 11 Part 2

### Two Dimensional Shapes and Their Attributes Lessons 3-9

Term | Definition |
---|---|

polygon | A closed figure made up of line segments |

side | A line segment that forms part of a polygon |

vertex of a polygon | The point where two sides of a polygon meet. |

diagonal | A line segment that connects two vertices of a polygon that are not next to each other. |

triangle | A polygon with three sides. |

quadrilateral | A polygon with four sides. |

pentagon | A polygon with five sides. |

hexagon | A polygon with six sides. |

octagon | A polygon with eight sides. |

decagon | A polygon with ten sides. |

equilateral triangle | A triangle having three sides of the same length. |

isosceles triangle | A triangle with at least two sides having the same length |

scalene triangle | A triangle in which no sides have the same length. |

right triangle | A triangle in which one angle is a right angle. |

acute triangle | A triangle in which all three angles are acute angles. |

obtuse triangle | A triangle in which one angle is an obtuse angle. |

trapezoid | A quadrilateral with exactly one pair of parallel sides. |

parallelogram | A quadrilateral with two pairs of parallel sides. |

rectangle | A special parallelogram with four right angles. |

rhombus | A special parallelogram in which all sides are teh same length. |

square | A special parallelogram with four right angles and all sides the same length. |

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Third Graders