Why can handle span and arm length not used as standard unit of length?
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hand span & arm length are not used as a standard unit of length as it changes with the change in the dimensions of a person's body.
a person may have long hands or arms and another may have short ones hence it is not used as a standard unit of length.
a person may have long hands or arms and another may have short ones hence it is not used as a standard unit of length.
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