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# Geometry

### Geometry Vocab

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

polygon | a closed figure made up of line segments that do not cross each other |

regular polygon | a polygon with congruent sides and congruent angles |

congruent sides | sides that are equal in length |

congruent angles | angles that have the same degree measure |

triangle | a polygon with three sides and three angles |

quadrilateral | a polygon with four sides and four angles |

pentagon | a polygon with five sides and five angles |

hexagon | a polygon with six sides and six angles |

octagon | a polygon with eight sides and eight angles |

attribute | a characteristic of a figure like side measures and angle measures |

isosceles triangle | a triangle with at least two congruent sides |

equilateral triangle | a triangle with all sides congruent |

scalene triangle | a triangle with no congruent sides |

acute triangle | a triangle with three acute angles |

right triangle | a triangle with one right angle and two acute angles |

obtuse triangle | a triangle with one obtuse angle and two acute angles |

trapezoid | a quadrilateral with exactly one pair of opposite sides that are parallel |

rectangle | a parallelogram with four right angles |

parallelogram | a quadrilateral with opposite sides congruent and parallel |

square | a parallelogram with four congruent sides and four right angles |

rhombus | a parallelogram with four congruent sides |

three-dimensional figure | a figure with length, width, and height |

net | a two-dimensional pattern of a three-dimensional figure |

cube | a three-dimensional figure with six faces that are congruent squares, has twelve edges and eight vertices, also called a square prism |

congruent figures | figures that have the same size and shape |

rectangular prism | a three-dimensional figure with six rectangular faces and opposite faces that are parallel and congruent |

face | a flat surface |

edge | where two faces meet |

vertex | a point where three or more faces meet |

prism | a three-dimensional figure that has at least three faces that are rectangles |

bases | the top and bottom faces |

rectangular prism | a prism with bases that are congruent rectangles, has six rectangular faces, twelve edges, and eight vertices |

triangular prism | a prism with triangular bases, has five faces, nine edges, and six vertices |

volume | the amount of space inside a three-dimensional figure |

composite figure | made up of two or more three-dimensional figures |

Created by:
Mrs.Cabell