[" The diameter of a roller is "84cm" and its length is "120cm" .It takes "500" complete "],[" revolutions to move once over to level a playground.Find the area of the playground "],[" in "m^(2)" ."],[" A cylindrical pillar is "50cm" in diameter and "3.5m" in height.Find the cost of painting "],[" the curved surface of the pillar at the rate of "712.50" per "m^(2)" .Find the cost of painting "],[" Curved surface area of a right circular cylinder is "4.4m^(2)" .If the radius of the base of the "],[" The inner diameter ef coint."]