The total surface area of a hemisphere of diameter 14cm is
Radius=7cm
Total surface area=3πr²
3πr²=3*22/7*7*7=462
If the volume of a sphere is divided by its surface area,the result is 27cm.Radius of the sphere is
The volumes of two spheres are in the ratio 64:27.The ratio of their surface area is
The surface area of a sphere is 2464.If its radius be doubled, surface area of new sphere is
Find the volume of a hemisphere whose radius is 21cm.
The curved surface area of two spheres are in the ratio 1:4.Find ratio of their volumes.