The height of a cone is 21 cm and its slant height is 28 cm. The volume of the cone is

How much cloth 2.5 m wide will be required to make a conical tent having base radius 7 m and height 24 m?

The volume of a cone is 1570 cm³ and its height is 15 cm. What is the radius of the cone? (Use)

The volume of a right circular cone of height 24 cm is 1232 cm³. Its curved surface area is

If the volumes of two cones be in the ratio 1 : 4. and the radii of their bases be in the ratio 4 : 5, then the ratio of their heights is