Theory:

Hemisphere:
A one half of a sphere is called a hemisphere.
shutterstock_1868810515 (1).jpg
Curved surface area:
\(C. S. A.\) \(=\) \(\frac{\text{Surface area of a sphere}}{2}\)
 
\(=\) 4πr22
 
\(=\) 2πr2
 
Curved surface area of a hemisphere \(=\) 2πr2 sq. units.
Total surface area:
\(T. S. A.\) \(=\) Curved surface area of a hemisphere \(+\) Area of the top region
 
\(=\) 2πr2 \(+\) \(\pi r^2\)
 
\(=\) \(3 \pi r^2\)
 
Total surface area of a hemisphere \(=\) \(3 \pi r^2\) sq. units.
 
Important!
Properties of hemisphere is same as the properties of sphere.