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# Module 11 Math

### Polygons

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

Acute triangle | Triangle where all angles are acute (less than 90 degrees) |

Decagon | Polygon with ten sides and ten angles |

Equilateral triangle | Triangle where all 3 sides and all 3 angles are the same size |

Heptagon | Polygon with seven sides and seven angles |

Hexagon | Polygon with six sides and six angles |

Isosceles triangle | Triangle where 2 sides and 2 angles are the same size |

Nonagon | Polygon with nine sides and nine angles |

Obtuse triangle | Triangle where one angle is obtuse (greater than 90 degrees). The other two are acute |

Octagon | Polygon with eight sides and eight angles |

Parallelogram | A quadrilateral where opposite sides are parallel and congruent |

Pentagon | Polygon with five sides and five angles |

Quadrilateral | a polygon with four sides and 4 angles |

Rectangle | A quadrilateral that is a parallelogram and has four right angles and sides that are perpendicular |

Regular Polygon | Polygon with all sides and all angles congruent |

Rhombus | a quadrilateral that is a parallelogram and has 4 congruent sides |

Right triangle | Triangle where one angle is a right angle (90 degrees). The other two are acute. |

Scalene triangle | Triangle where no sides and no angles are the same size |

Square | a quadrilateral that is a parallelogram a rectangle and a rhombus |

Trapezoid | A quadrilateral with only one pair of parallel sides |

Triangle | Polygon with three sides and three angles |

Created by:
Shebro