If the volume of a sphere is divided by its surface area,the result is 27cm.Radius of the sphere is
Volume=4/3∏r³
Surface area=4∏r²
Volume/Surface Area=1/3r=27
r=81
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.
Spheres A and B have their radii 40cm and 10cm respectively.The ratio of surface area of A to the surface area of B is