The radius of a sphere is 1.41 cm. Its volume to an appropriate number of significant figures is

Radius of the sphere, r = 1.41 cm(3 significant figures)

Volume of the sphere, $\mathrm{V}=\frac{4}{3}{\mathrm{\pi r}}^3=\frac{4}{3}\times 3.14\times {\left(1.14\right)}^3$

                                                  = $11.736{\mathrm{cm}}^3$

Rounded off up to 3 signifiant figures = 11.7 ${\mathrm{cm}}^3$