##### Sections

###### Vocabulary

###### The Polygon Angle-Sum Theorems

###### Properties of Parallelograms

###### Proving That a Quadrilateral Is a Parallelogram

###### Properties of Rhombuses, Rectangles, and Squares

Exercise name | Free? |
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Properties of Rhombuses, Rectangles, and Squares 21 | |

Properties of Rhombuses, Rectangles, and Squares 22 | |

Properties of Rhombuses, Rectangles, and Squares 23 | |

Properties of Rhombuses, Rectangles, and Squares 24 | |

Properties of Rhombuses, Rectangles, and Squares 25 | |

Properties of Rhombuses, Rectangles, and Squares 26 | |

Properties of Rhombuses, Rectangles, and Squares 27 | |

Properties of Rhombuses, Rectangles, and Squares 28 | |

###### Conditions for Rhombuses, Rectangles, and Squares

###### Trapezoids and Kites

###### Polygons in the Coordinate Plane

###### Coordinate Geometry and Coordinate Proofs

##### Other subchapters in Polygons and Quadrilaterals