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**Design & Drafting Technology Unit 4**

Terms & Definitions Design & Drafting Technology Unit 4

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Arc Any portion of the circumference of a circle

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Diameter The distance across a circle passing through its center point

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

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

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

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**Freehand Technical Sketching**

Making a drawing without the use of instruments, yet with care taken to obtain the correct line widths

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Major Axis The axis passing through the foci of an ellipse

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

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

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

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

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

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