Question:
Find the total surface area of a hemisphere and a solid hemisphere each of radius 10cm (π = 3.14)
Solution:
The surface area of the hemisphere $=2 \pi r^{2}$
$=2 \times 3.14 \times(10)^{2}$
$=628 \mathrm{~cm}^{2}$
The surface area of solid hemisphere $=2 \pi r^{2}$
$=3 \times 3.14 \times(10)^{2}$
$=942 \mathrm{~cm}^{2}$