Question

what is the formula of volume of solid spare and hollow spare?

Answer 1

Let r = radius of the solid sphere
volume of the solid sphere = $\frac{4}{3}{\mathrm{\pi r}}^3$
Let r_​1 = inner radius of hollow sphere
Let r₂ = outer radius of hollow sphere
volume of hollow spherical shell = $\frac{4}{3}\mathrm{\pi }\left[{{\mathrm{r}}_2}^3-{{\mathrm{r}}_1}^3\right]$