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What is the purpose of holding a pencil at full arm's length during sight measuring?

Answer and explanation

Correct answer: To keep the measuring distance constant

The governing concept is consistent comparative measurement. Holding the pencil at full arm’s length keeps the distance between the eye, pencil, and subject approximately fixed, so measured widths, heights, and angles can be compared reliably. Therefore option B is correct. Making the pencil appear longer, darkening a line, or straightening the paper is not the purpose. Repeatedly bending the arm would change the scale and reduce accuracy.

Related tags

Sight MeasuringArm LengthComparative MeasurementProportionObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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