If the diameter of the base of a closed right circular cylinder be equal to its height h, then its whole surface area is

A cylinder with radius r and height h is closed on the top and bottom. Which of the following expressions represents the total surface area of this cylinder?

The height of sand in a cylindrical-shaped can drops 3 inches when 1 cubic foot of sand is poured out. What is the diameter, in inches, of the cylinder?

A right curcular cylindrical tunnel of diameter 2 m and length 40 m is to be constructed from a sheet of iron. The area of the iron sheet required in m², is

Two steel sheets each of length a₁ and breadth a₂ are used to prepare the surfaces of two right circular cylinder —one having volume v₁ and height a₂ and other having volume v₂ and height a_1. Then,