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# Unit 4: Geometry

### Vocabulary for Unit 4

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

Acute Angle | An angle that measures less than 90 degrees. |

Right Angle | An angle that measures exactly 90 degrees. |

Obtuse Angle | An angle that measures more than 90 degrees. |

Equilateral | A triangle with all equal sides. |

Scalene | A triangle with no equal sides. |

Isosceles | A triangle with two equal sides. |

Complementary Angles | The sum of two or more angles that equal exactly 90 degrees. |

Supplementary Angles | The sum of two or more angles that equal exactly 180 degrees. |

Vertical Angles | A pair of angles that are on opposite sides of a vertex and are always equal. |

The sum of all angles in a triangle will always equal? | 180 degrees |

Triangle Inequality Theorem | The two shortest side lengths of a triangle must have a sum greater than the longest side length of a triangle. |

Area of a Rectangle/Square | A = length x width |

Area of a Parallelogram | A = base x height |

Area of a Circle | A = pi x radius squared |

Area of a Trapezoid | A = one half times height times the sum of base 1 and base 2 |

Area of a Triangle | A = one half times base times height |

Volume Formula | V = area of the base times height |

Radius | The length from the origin of a circle to the perimeter |

Diameter | The length through a circle that passes through the origin |

Circumference | The distance around a circle |

What is 2D? | 2- dimensional, a flat shape, no depth |

What is 3D? | 3-dimensional |

Define area. | Area covers the surface or face |

Define volume. | Volume fills a 3D object |

Characteristics of a Prism | Prisms are 3D shapes that always have two equal, parallel bases |

Characteristics of a Pyramid | Pyramids are 3D shapes that have one base opposite of the vertex |

Face | A face of a 3D shape is a flat surface |

Vertex | Where 3 or more edges intersect |

Edge | Where two faces intersect |

Origin | Center of a circle |

Surface Area | The measurement to cover all the faces of a 3D object |