A girl used a ruler to measure the dimensions(length, breadth ,height) of a gift pack to wrap it by a glittery paper .The wrapping glittery paper get shorten due to the wrong measurements. Which of the following precautions will you suggest her while using ruler
Keep your eyes vertically above the ruler while taking reading
Ruler should not be touched with the object
Both (a) & (b)
None of these
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Explanation:
keep your eyes vertically above.
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