Isometric scaling property In isometric drawings (an axonometric subset), the three principal axes are equally inclined to the picture plane, resulting in equal foreshortening along all three axis directions.

Introduction / Context:
Isometric projection is the most widely used axonometric technique for pictorial representation in engineering because it balances realism with drafting simplicity. Its hallmark is uniform scaling along the X, Y, and Z axes, which makes measuring and constructing geometry straightforward compared to other pictorial methods.

Given Data / Assumptions:

• The axes are oriented such that they are 120 degrees apart in the drawing.
• Parallel projection is used; lines parallel to axes remain parallel.
• No perspective convergence occurs.

Concept / Approach:
Equal axis inclination to the projection plane yields identical foreshortening factors for all three directions. Consequently, a unit length along any principal axis is represented by the same scaled length on paper. This uniformity is what differentiates isometric (three equal) from dimetric (two equal) and trimetric (three different) axonometric views.

Step-by-Step Solution:

Verification / Alternative check:
Compare to dimetric and trimetric tables; only isometric lists a single (equal) foreshortening factor for all axes.

Why Other Options Are Wrong:
Trimetric explicitly uses three different scales; “no scale applied” misunderstands projection scaling; perspective rendering introduces convergence and nonuniform scaling.

Common Pitfalls:
Misplacing the axes (not 120 degrees), mixing isometric with oblique cabinet drawings, and assuming on-paper measurements replace true dimensions.

Final Answer:
Correct