Axonometric, oblique, and perspective sketches show objects pictorially.

More Questions from Layouts and Lettering

• Three systems are used to arrange orthographic views: first, second, and third angle projection.
• The same general concepts and drafting standards apply to CAD as to drawings created by hand.
• The main difference between a CAD drawing and a freehand sketch is in the appearance of lines.
• With regard to lettering, the shapes of letters are not described as part of drawing standards.
• Drawing units must be clearly stated on the drawing.
• In orthographic projection objects can be presented at true size or scaled at a proportion of their true size.
• Drawings that use U.S. customary units do not follow ANSI/ASME standards.
• Scale is stated as a ratio of the number of drawing units to the number of actual units.
• Orthographic projections have projectors that are parallel to the plane of projection.

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