length of a needle is measured by scale reading of scale at one end is 3 cm and other end is 22.9 cm what is the length of a needle
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we measured the needle with 3 cm to 22.9 cm and we left 2 cm i.e. is 0,1,2
that means we left 2 cm so we will subtract from 22.9 cm to get the length i.e is 22.9-2=20.9cm hence the length of needle is 20.9cm
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