Which term refers to a drawing of a 3D object where the three axes are perpendicular and scales along each axis are true to scale?

• A. Globe gore
• B. Geostenography
• C. Analemma
• D. Isometric Diagram

Answer: (D)

Isometric projection is a way to draw a 3D object on a 2D plane so that the three principal directions are shown with equal foreshortening. In this method, each axis is scaled the same way, so measurements along X, Y, or Z on the drawing correspond to the real dimensions of the object. The axes on the page are arranged so they appear at 120-degree angles to one another, which preserves the relative proportions without perspective distortion. This combination—equal scale along all three axes and a consistent, axis-aligned depiction—is what makes the diagram isometric. Other terms describe different concepts or uses and don’t capture this specific equal-axis scaling in a 3D-to-2D drawing.