Relative error of a measurement is the absolute error divided by

the "true" measurement.  

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Absolute error is the amount of physical error in a measure of an object.

The physical error of the measure or the measurement is precise to

within 0.05km.

Substitute absolute error and true value in the formula.

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         (Simplify)
        (DIvide: )
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    (Using of calculator)  \
T  \
he relative error for measurement of 63.7 is 0.0784%.
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