The diameters of two cones are equal. If their slant heights are in the ratio 5 : 4, the ratio of their curved surface areas, is

A right circular cylinder and a right circular cone have the same radius and the same volume. The ratio of the height of the cylinder to that of the cone is

If the base radius and the height of a right circular cone are increased by 20%, then the percentage increase in volume is approximately

If h, S and V denote respectively the height, curved surface area and volume of a right circular cone, then 3πVh³-S²h²+9V² is equal to

If a cone is cut into two parts by a horizontal plane passing through the mid-point of its axis, the ratio of the volumes of upper and lower part is