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# CADD-1 Lesson 4

### Drafting Tools & Geometry for Drafting

Word or Phrase | Definition |
---|---|

Protractor | Tool used to measure and draw angles. |

Compass | Used to accurately draw circles manually. |

T-Square | Tool used to create horizontal lines manually. |

Dividers | Used to transfer distances accurately. |

Scale | Contains calibrations in some exact proportion to full size, used to measure or layoff distances. |

Triangle | Used in combination with a T-square to draw lines at various angles or to produce right angles. |

Template | Used to quickly draw circles, ellipses, polygons, etc. |

Shield | Used to erase only portions of a drawing while protecting other lines. |

French Curve | An instrument used to draw irregular shaped curves. |

Vellum | Durable transparent paper used for permanent drawings. |

OSNAPS | Purpose in AutoCAD is to increase accuracy and precision. |

Geometry | The study of the size and shape of things. |

Obtuse Angle | More than 90, less than 180 degrees. |

Acute Angle | Less than 90 degrees. |

Supplementary Angles | Two Angles that add up to 180 degrees. |

Complimentary Angles | Two Angles that add up to 90 degrees. |

Parallel Lines | Two or more lines that are equal distance apart. |

Radius | The distance of a straight line measured from the center of an arc or circle to any point on the circumference. |

Diameter | Distance of a straight line that passes through the center of the circle touching opposite points on the circumfernece. |

Rectangle | Opposite sides are equal, internal angles are 90 degrees. |

Square | All four sides are equal, internal angles are 90 degrees. |

Regular Polygon | Three or more equal straight sides with internal angles that are equal. (Example: Hexagon, Octagon) |

Concentric | Two or more circles that share the same center. |

Eccentric | Two or more circles that do not share the same center. |

Customary units | Unit of measurement used in the United States. (English or Standard units) |

Drawing to Scale | Process of reducing or enlarging an object. |

Hypotenuse | The longest side of right angle. |

Geometric Construction | A drawing made up of points and lines drawn in proper relationship to one another to solve design problems. |

Equilateral Triangle | Name given to a triangle with equal sides and equal angles. |

Isoceles Triangle | Triangle with two sides of equal length. |

Circumference | The distance around a circle. |

Perpendicular | Lines drawn at 90 degrees or Right Angles. |

Inscribed | Inside the imaginary circle. |

Circumscribed | Outside the imaginary circle. |

Tangent | A line or arc that connects to another line or arc at only one point without any crossing or intersection, and flows away from that point. |

Pythagorean Theorem | Used to calculate the hypotenuse of a right triangle. |

Created by:
tmurphy