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  4. The area of a sheet of length 10.2 cm and width 6.8 cm addressed upto proper number of significant figures is

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Q. The area of a sheet of length $10.2\, cm$ and width $6.8\, cm$ addressed upto proper number of significant figures is

Physical World, Units and Measurements

Solution:

$I=10.2\, cm$
$w=6.8\, cm$
Area $=I w=10.2 \times 6.8=69.36$
$\Rightarrow $ Area $=69\, cm ^{2}$