Question:
The length and the radius of a cylinder measured with a slide calipers are found to be $4.54 \mathrm{~cm}$ and $1.75 \mathrm{~cm}$ respectively. Calculate the volume of the cylinder.
Solution:
Length $L=4.54 \mathrm{~cm}$, radius $r=1.75 \mathrm{~cm}$
Volume $=\pi r^{2} L=\pi \times(4.54) \times(1.75)^{2}=43.6577 \mathrm{~cm}^{3}$.
Now, it has to be rounded off to 3 significant digits, so we see that after 6 , the value is 5 . So 6 becomes 7 , and thus the rounded off value is given by $V=43.7 \mathrm{~cm}^{3}$.