Question

Find the surface area and the volume of a sphere with radius $1.4cm$.

Answer 1

Given:
Radius of sphere $\left(r\right)=1.4cm$
Surface area $=4\pi r^2$
$=4\times \frac{22}{7}\times 1.4\times 1.4$
$=24.64{cm}^2$
Volume of the sphere $=\frac{4}{3}\pi r^2$
$=\frac{4}{3}\times \frac{22}{7}\times 1.4\times 1.4\times 1.4$
$=11.5{cm}^3$
Hence, surface area of sphere $=24.64{cm}^2$ and its volume $=11.5{cm}^3$