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Why must the thumb position remain fixed on the pencil during sight measurement?

Answer and explanation

Correct answer: To compare measurements on the same scale

Sight measurement depends on a stable reference. The pencil is held at a fixed arm distance, and the thumb marks the measured length; keeping its position unchanged allows widths and heights to be compared on the same scale. Therefore, option B is correct. Moving the thumb changes the reference and creates proportion errors. The position has nothing to do with decoration, line darkness, or holding the paper.

Related tags

Sight MeasurementPencil DrawingProportionSketching AccuracyObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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