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Why are horizontal and vertical reference lines useful when checking an object's direction?

Answer and explanation

Correct answer: They provide a stable basis for comparing tilt and alignment

The governing concept is observational alignment. Horizontal and vertical reference lines act like a fixed coordinate frame, allowing the artist to compare an object's edges, axis, and tilt with reliable directions. If a top edge should be horizontal but slopes downward, or a central axis drifts from vertical, the error becomes visible. Option A is correct; the other choices describe effects unrelated to checking direction.

Related tags

Reference LinesTiltAlignmentObservationObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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