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# Unit 12

### Unit 12 Area and Perimeter of Geometric Shapes

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

perpendicular | Two lines that meet at a point and form right angles (90°) to each other. |

parallel | Lines in the same plane that never intersect and remain the same distance apart from each other. |

quadrilateral | A four-sided polygon. |

altitude | A perpendicular distance from a vertex to its opposite side in a polygon. |

supplemental angles | Two angles whose measures have a sum of 180°. |

parallelogram | A quadrilateral with both pairs of opposite sides parallel. Opposite sides lengths are congruent and opposite angles are equal measures. Consecutive angles are supplementary angles. |

trapezoid | A quadrilateral with only one pair of parallel sides. |

triangle | A polygon with three sides and three angles. |

area | The amount of square units covered by a two dimensional figure. |

hypotenuse | The long side opposite the right angle in a right triangle. |

perimeter | The sum of the lengths of a closed plane figure. |

circumference | The distance around the circle. |

radius | A segment whose endpoints are the center of a circle and a point on the circumference of the circle. |

diameter | A segment that passes through the center of a circle and whose endpoints are on the circumference of the circle. |

Pi | The ratio of the circumference of the circle to the length of the diameter. π≈3.14π ≈ 3.14 |

proportion | An equation that states two ratios are equivalent. |

sector | The part of a circle enclosed by two radii of a circle and their intercepted arc. (A pie-shaped part of a circle) |

composed | To create something. |

decomposed | To break something down into smaller parts or pieces. |

breadth | The distance from one side of an object to the other side. |

composite figure | A two dimensional geometric figure made from two or more two dimensional geometric figures. |

semi-circle | Half of a circle. |

Created by:
Mrs Ott