If h is the height and r is the base radius of an open right circular cylinder of given volume has least surface area, then

Show that the height of a closed right-circular cylinder of given volume and least surface area is equal to its diameter.

Show that the height of a closed right circular cylinder of a given volume and least surface area is equal to its diameter.

The height and radius of the base of a right circular cylinder is 'r'. Find its totalsurface area.

The height and radius of the base of a right circular cylinder is 'r'. Find its totalsurface area.

The height 'h' and radius 'r' of a right circular cylinder which is open at the top and has a given surface area, will have the greatest volume if

Show that the radius of closed right circular cylinder of given surface area maximum volume is equal to half of its height.

The sum of the radius of the base and height of a solid right circular cylinder is 37 cm. if its total surface area is 1628 cm^(2) . Find its volume.