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Terms & Definitions
Design & Drafting TechnologyUnit 4
Arc
• Any portion of the circumference of a circle
Diameter
• The distance across a circle passing through its center point
Radius
• The distance from the center point of a circle to the outside circumference
Ellipse
• A foreshortened circle having a major axis and a minor axis
Focus (Foci)
• Point(s) at which lines come toward each other or move away from each other
Freehand Technical Sketching
• Making a drawing without the use of instruments, yet with care taken to obtain the correct line widths
Major Axis
• The axis passing through the foci of an ellipse
Minor Axis
• The chord of an ellipse passing though the center perpendicular to the major axis
Isometric Sketch
• A sketch based on the object being drawn on three axes spaced 120 apart
Oblique Sketch
• A sketch that shows the face of the object parallel with the plane of projection
Cabinet Sketch
• A sketch that shows only the face or the front of an object
Proportioning
• Drawing parts of an object in the same size relationship as the object itself