1. Design & Drafting Technology Unit 4
Terms & Definitions
Design & Drafting Technology
Unit 4

2. Arc
Any portion of the circumference of a circle

3. Diameter
The distance across a circle passing through its center point

4. Radius
The distance from the center point of a circle to the outside circumference

5. Ellipse
A foreshortened circle having a major axis and a minor axis

6. Focus (Foci)
Point(s) at which lines come toward each other or move away from each other

7. Freehand Technical Sketching
Making a drawing without the use of instruments, yet with care taken to obtain the correct line widths

8. Major Axis
The axis passing through the foci of an ellipse

9. Minor Axis
The chord of an ellipse passing though the center perpendicular to the major axis

10. Isometric Sketch
A sketch based on the object being drawn on three axes spaced 120 apart

11. Oblique Sketch
A sketch that shows the face of the object parallel with the plane of projection

12. Cabinet Sketch
A sketch that shows only the face or the front of an object

13. Proportioning
Drawing parts of an object in the same size relationship as the object itself