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Why must the pencil remain parallel to the picture plane while measuring an object's angle?

Answer and explanation

Correct answer: So the observed angle is not visually distorted

The governing concept is consistent sight-based measurement. The pencil serves as a visual straightedge for comparing an edge with the picture plane. If it tilts toward or away from the observer, its apparent angle changes because the measuring tool is no longer held in the same visual plane as the reference. Therefore option A is correct. Pencil darkness, apparent object size, and shadow removal are unrelated to angular accuracy.

Related tags

Object-ObservationAngle-MeasurementPicture-PlanePencilObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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