What characteristic of an isometric drawing distinguishes it from orthographic projections?

In an isometric drawing, the characteristic that specifically distinguishes it from orthographic projections is the use of angles of 30 degrees to the horizontal. This angle helps to create a visual representation where the three axes of an object (height, width, depth) are represented in a way that allows for an apparent three-dimensional form on a two-dimensional surface.

Unlike orthographic projection, which displays multiple views of an object (such as front, top, and side) in true sizes and shapes without perspective, isometric drawings convey depth by skewing the axes at specific angles. This skewing of the axes creates a more visually engaging representation that emphasizes three-dimensionality. In addition to the angles utilized, isometric drawings employ parallel lines along each axis, allowing for an easier understanding of spatial relationships compared to the more technical and flat nature of orthographic projections.

In summary, the 30-degree angles used in isometric drawings create a unique three-dimensional appearance that cannot be achieved in traditional orthographic projections, which rely strictly on flat representations from multiple views.