Technical Drawing — In CAD-based auxiliary construction, one practical method is to align the user coordinate system (UCS) so that its XY plane coincides with the inclined face; this makes the subsequent auxiliary view orthographic to that plane and reveals its true shape and size.

Introduction / Context:
Auxiliary views are orthographic views taken on planes that are not parallel to the principal planes (front, top, side). In CAD, a common workflow is to align the user coordinate system (UCS) with the target inclined plane so the view camera and dimensioning operate orthogonally to that face.

Given Data / Assumptions:

• We are creating an auxiliary view to show an inclined surface in true shape and size.
• The CAD system allows redefining the UCS (e.g., AutoCAD, similar tools).
• Dimensions placed in the auxiliary will be orthogonal to the reoriented UCS.

Concept / Approach:
True shape of an inclined plane is obtained when the projection plane is parallel to that plane. By aligning the UCS so that its XY plane is parallel to the inclined surface, the auxiliary view becomes orthographic relative to that face, eliminating foreshortening.

Step-by-Step Solution:
1) Identify the inclined face whose true shape is needed.2) Realign the UCS so the XY plane coincides with the inclined surface (via three points or face pick).3) Create construction geometry and generate the auxiliary projection.4) Dimension and annotate; all lengths now reflect true size on that face.

Verification / Alternative check:
A measurement taken on edges lying in the plane should match model distances without foreshortening. If values differ, the plane or UCS is not truly parallel.

Why Other Options Are Wrong:
“Incorrect” ignores standard CAD practice; “Only 3D solids” is false—2D profiles benefit as well; “Perspective views” are not orthographic; “Three planes simultaneously” is unnecessary for a single auxiliary.

Common Pitfalls:
Forgetting to lock UCS before drafting; dimensioning from a non-parallel UCS leading to distorted values; mixing principal and auxiliary dimensions on one view.

Final Answer:
Correct