Question

What is the surface area of the hemisphere whose diameter is $28\text{cm}$?

Answer 1

Surface area of the hemisphere $=2\pi r^2$
Diameter $=$ Radius $\times 2$
$\therefore$ Radius $=14\text{cm}$
$\therefore$ Surface area $=2\times \frac{22}{7}\times {14}^2$
$=1232{\text{cm}}^2$