Find the volume of a hemisphere whose radius is 21cm.
Radius=21
Volume=2/3(∏r³)=2/3*22/7*21*21*21=19404
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.
The difference between the circumference and radius of a circle is 74cm.Find area of the circle.