Which term describes a 3D drawing where vertical lines remain vertical and horizontal lines are drawn at 30°, used to show the shape of a product clearly?

• A. Orthographic drawing
• B. Isometric drawing
• C. Secondary research
• D. Annotation

Answer: (B)

Isometric drawing presents a 3D view in which vertical edges stay vertical and the horizontal edges recede at 30 degrees to the horizontal. This setup keeps all three axes equally foreshortened, so the shape and proportions of the product are clear in one view and measurements are easier to interpret. This is why it’s used to show the form of a product clearly. Orthographic drawing, by contrast, uses separate views (front, top, side) and isn’t a single 3D representation, while secondary research and annotation aren’t about depicting the object’s shape in 3D.