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# Quadrilaterals

### SOL 7.6 a) compare and contrast quadrilaterals based on their properties

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

polygon | a closed plane figure composed of at least three line segments that do not cross |

quadrilateral | a polygon with four sides |

diagonal | a segment in a polygon that connects two vertices but is not a side |

bisect | means to divide into two equal parts |

lines of symmetry | divides a figure into two congruent parts each of which is the mirror image of the other |

parallelogram | a quadrilateral with both pairs of opposite sides parallel |

properties of a parallelogram | - opposite sides are parallel and congruent; - opposite angles are congruent; and - diagonals bisect each other and one diagonal divides the figure into two congruent triangles |

rectangle | quadrilateral with four right angles |

properties of a rectangle | - opposite sides are parallel and congruent; - all four angles are congruent and each angle measures 90; and - diagonals are congruent and bisect each other. |

square | a quadrilateral that is a regular polygon with four congruent sides and four right angles |

properties of a square | - opposite sides are congruent and parallel; - all four angles are congruent and each angle measures 90; and - diagonals are congruent and bisect each other at right angles. |

Number of lines of symmetry in a square | 4 |

Number of lines of symmetry in a parallelogram (not a rectangle or rhombus) | 0 |

Number of lines symmetry in a rectangle and rhombus | 2 |

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