Question

Find the volume and surface area of a sphere of radius 4.2 cm. ($\mathrm{\pi }=\frac{22}{7}$)

Answer 1

We have:
Radius of the sphere = 4.2 cm
Thus, we get:
Volume of the sphere = $\frac{4}{3}\mathrm{\pi }{r}^{\mathit{3}}$
= $\frac{4}{3}\times \frac{22}{7}\times {\left(4.2\right)}^3$
= 310.464 cm³
And,
Total surface area of the sphere = 4$\mathrm{\pi }$r²
= $4\times \frac{22}{7}\times {\left(4.2\right)}^2$
= 221.76 cm²