The radius of a cylinder and a hemisphere is equal and their volumes are equal. The height of the hemisphere is greater than the height of the cylinder by

By melting a solid right circular cylinder, a solid right circular cone of same height as the cylinder is made. The ratio of the radii of the cylinder and the cone is  _____$: \sqrt{3}$

The two radii and the volumes of a sphere and a right circular cylinder are the same. The ratio of the height and the radius of the cylinder is $\frac{3}{4}$.