The length and breadth of a rectangular sheet are 25.2 cm and 16.8 cm, which have both been measured to an accuracy of 0.1 cm. Find the relative error in the area of the sheet.
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Area=l×b
∆A/A=∆1/1+∆b/b
=(0.1/25.2+0.1/16.8) =0.00992≈0.01
This is the relative error.
Percentage error =0.01×100=1%
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