If a hemisphere of maximum size is curved out from a cone of base radius 15 cm and height 20 cm. Find its
Volume.

Calculate the volume of a cylinder of base radius 7 cm and height 7cm.

Find the volume of the cone having radius 7 cm and height 18 cm.

A hollow sphere of internal and external radii are 6 cm and 8 cm respectively is melted and recast into small cones of base radius 2 cm and height 8 cm . Find the number of cones .

A clown's cap is in the form of a right circular cone of base radius 7 cm and height 24 cm . Find the area of the sheet required to make 10 such caps.

A frustum of cone with radii 20 cm and 32 cm has height 8 cm. its volume is