It is also called lateral surface area. The curved surface area of a sphere is 4pir2 or pid2. Curved surface areaCSA 2 p r 2 Total surface area TSA 3 p r 2.
Where r radius p 314.
Curved surface areaCSA 2 p r 2 Total surface area TSA 3 p r 2. Hollow hemisphere P 3R 2 r 2 sq. Curved Surface Area CSA of Sphere 4pr². He also realized that the surface area of a sphere is exactly equal to the area of the curved wall of its circumscribed cylinder which is the smallest cylinder that can contain the sphere.