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Why must the pencil be held at a fixed distance during visual measurement?

Answer and explanation

Correct answer: So all proportional comparisons use the same scale

The governing concept is sighting for proportional measurement. A pencil held at arm’s length acts as a temporary measuring scale: widths and heights can be compared consistently only when the viewing distance and arm position remain unchanged. If the pencil moves nearer or farther, its apparent size changes and the comparison becomes unreliable. Thus option A is correct; the other choices do not follow from visual measurement.

Related tags

SightingVisual MeasurementProportionObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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