The surface area of a sphere is 2464.If its radius be doubled, surface area of new sphere is
Surface area=4πr²=2464
4*22/7*r²=2464,r²=196 ,r=14
New radius=28
Surface area=4π=4*22/7*28*28=9856
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
Find the volume of a sphere whose radius is 7cm.
Find the volume and surface area of a sphere of diameter 42cm.
