The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures.

Explanation

l=4.234m, b=1.005m, thickness h=2.01 cm=0.0201 m
Total area `=2[lb+lh+bh]`
`=2[4.234xx1.005+4.234xx0.0201+1.005xx0.0201]`
`=8.7209m^(2)=8.72m^(2)`
correcting to three significant figures as there are only three significant figures in thickness,
Volume`=lxxbxxh`
`=4.234xx1.005xx0.0201=0.085528m^(3)=0.0855m^(3)`
Volume is correct upto three significant figures.