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# Polygons

### Different types of polygons

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

Polygon | A many sided closed figure named according to the number of angles and sides they have- Greek word "poly" means many; Greek word "gon" means angles |

Equilateral Polygon | All sides are congruent |

Equiangular Polygon | All sides are congruent |

Regular Polygon | All sides and all angles are congruent |

Vertices | Endpoints of the sides of a polygon |

Diagonal | Line segment connecting two nonadjacent vertices in a polygon |

Convex Polygon | No diagonals contains points outside the polygon; no angle greater than 180°; a line crosses at most two sides. |

Concave Polygon | Lines can be drawn outside the polygon; at least one interior angle is greater than 180°(reflex angle); at least one line can be drawn across more than two sides |

Quadrilateral | Four side, four angles, and four vertices |

Parallelogram | Quadrilateral with both pairs of opposite sides parellel and congruent |

Rhombus | Parallelogram with four congruent sides |

Rectangle | Parallelogram with four right angles |

Square | Parallelogram with four congruent sides and four right angles |

Kite | Quadrilateral with two pair adjacent sides congruent and no opposite sides congruent |

Trapezoid | Quadrilateral with exactly one pair of parallel sides |

Isosceles Trapezoid | Trapezoid whose nonparallel sides are congruent |

Right Trapezoid | Trapezoid with two right angles |

Pentagon | Five sided polygon, five angles, five vertices |

Hexagon | Six sided polygon, six angles, six vertices |

Heptagon | Seven sided polygon, seven angles, seven vertices |

Octagon | Eight sided polygon, eight angles, eight vertices |

Nonagon | Nine sided polygon, nine angles, nine vertices |

Decagon | Ten sided polygon, ten angles, ten vertices |

Dodecagon | Twelve sides, twelve angles, twelve vertices |

n-gon | n sides, n angles, n vertices |