Question

Find the surface area of a sphere of radius $10.5cm$.

Answer 1

Find the surface area of the sphere

The surface area of the sphere having radius $\left(r\right)$ $=4{\mathrm{\pi r}}^2$

$=4\times \frac{22}{7}\times {\left(10.5\right)}^2$ ( $\mathrm{\pi }=\frac{22}{7}$ )

$=\frac{88\times 15\times 105}{100}$

$=1386c{m}^2$

Hence, the surface area of the sphere is $1386c{m}^2$.