vi) A unit that can be used as a reliable unit of length is:
a) Footstep
b) inch
c) cubit
d) hand span
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Answer:
Inch
Explanation:
All the other above mentioned units are ancient units which measures length with the help of forearm,footsteps,etc. The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement.
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