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  4. The length and breadth of a metal sheet are 3.124 m and 3.002 m respectively. The area of this sheet up to four correct significant figures is

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Q. The length and breadth of a metal sheet are $3.124 m$ and $3.002 m$ respectively. The area of this sheet up to four correct significant figures is

Physical World, Units and Measurements

Solution:

Given length $(l)=3.124 m$ and breadth $(b)=3.002 m$. Area of the sheet
$(A)=l \times b=3.124 \times 3.002=9.378248 m ^{2}$.
Since both length and breadth have four significant figures, therefore area of the sheet after rounding off to four significant figures is $9.378 m ^{2}$.