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

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

Physical World, Units and Measurements

Solution:

Radius of the sphere, $r = 1.41 \,cm$
($3$ significant figures)
Volume of the sphere,
$V=\frac{4}{3}\,\pi r^{3}=\frac{4}{3}\times3.14 \times\left(1.41\right)^{3}\,cm^{3}$
$=11.736\,cm^{3}$
Rounded off upto $3$ significant figures $= 11.7\, cm^3$.