Which statement correctly distinguishes isometric projection from orthographic projection?

• A. Isometric projection uses a single viewpoint; orthographic uses multiple viewpoints.
• B. Isometric projection is a two-dimensional view.
• C. Orthographic projection shows perspective; isometric projection does not.
• D. Isometric projection is a three-dimensional representation with equal scaling on three axes; orthographic projection uses multiple 2D views with no perspective.

Answer: (D)

Isometric projection shows a three-dimensional representation on a plane with equal scaling along the three principal axes, and it does not use perspective. This means the object is drawn so that x, y, and z directions are foreshortened equally, giving a single view that clearly conveys depth without converging vanishing points.

Orthographic projection, on the other hand, uses parallel projection lines perpendicular to the drawing plane and typically presents multiple two-dimensional views (such as front, top, and side). There is no perspective in these views, and each view shows true dimensions in its own plane, but depth is not represented in a single combined image.

So the best distinction is that isometric provides a single 3D-looking view with equal axis scaling and no perspective, while orthographic relies on multiple 2D views with no perspective.