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# Polygons 5G3&4

### Classify Shapes

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

polygon | A closed plane figure (2-D) made up of line segments |

regular polygon | A polygon that has sides of equal length and angles of equal measure |

triangle | A polygon with 3 sides |

quadrilateral | A polygon with 4 sides |

pentagon | A polygon with 5 sides |

hexagon | A polygon with 6 sides |

octagon | A polygon with 8 sides |

equilateral triangle | A triangle whose sides all have the same length |

isosceles triangle | A triangle with two sides of 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 whose angles are all acute angles |

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

parallelogram | A quadrilateral with 2 pair of parallel and congruent sides |

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

rectangle | A parallelogram with 4 right angles |

rhombus | A parallelogram with all sides the same length |

square | A rectangle with all sides the same length |

congruent | Same size or equal |

attributes | A feature used to describe a shape such as lines and angles. Also known as properties of a shape. |

2 - dimensional figures | A shape that has width and height, but no thickness |

classify | To arrange in groups based on common attributes or properties |

category | A group of of objects (or shapes) with common attributes |

sub category | A smaller group within a category, that is classified by having common attributes not shared with rest of the objects in the category |

parallel lines | lines that never intersect (cross) and are the same distance apart |

opposite angles | Angles on a quadrilateral that are diagonally across from each other |

consecutive angles | Angles on a quadrilateral that are next to each other. |

adjacent sides | Two sides of a polygon that meet at the same vertex (point) |