# The length of a cube is $2.1 \times 10^{-2}\;m$ . The volume in significant figures will be

$\begin{array}{1 1} 9.2 \times 10^{-4} \;m^{2} \\ 9.3 \times 10^{-4} \;m^3 \\ 9.26 \times 10^{-6} \;m^2 \\9.261 \times 10^{-6} \;m^2 \end{array}$

Answer : $9.3 \times 10^{-4} \;m^3$
Volume $=(2.1 \times 10^{-2} )^3 m^3=9.261 \times 10^{-6}m^3$
Rounding off to two significant figures, we get $9.3 \times 10^{-6} m^3$