If a plane that passes through a sphere’s centre splits the sphere into two equal parts, each part is called a hemisphere.
A solid body surface area is the area of all of the surfaces together and is usually measured in a square unit.
A solid hemisphere of radius = r
The surface area of a sphere of radius r = 4πr2
The surface area of the hemisphere = 2πr²
If you have a hemispheric body then it has a base that is a circle of radius = r
The area of a circle of radius r = πr²
The total surface area of the hemisphere = 2πr² + πr²
TSA of the hemisphere = 3πr² sq units