1. Find the total surface area (in cm2) of a cylinder of radius 3.5 cm and height 55 cm.   Hint Hint       2. A metallic pipe (open at both ends) 40 cm long has an external diameter of 50 cm. The thickness of the metallic pipe is 2 cm. Find the total surface area (in cm2) of the metallic pipe.   Hint       3. Find the curved surface area (in cm2) of a cylinder of diameter 28 cm and height 40 cm.   Hint       4. The total surface area of a cylinder of radius 7 cm is 1848 cm2. Find the height (in cm) of the cylinder.   Hint       5. A road roller of diameter 98 cm has a length of 125 cm. It makes 4000 complete revolutions in order to level a field. Find the cost (in $) of leveling it at 4 cents per square meter.   Hint       6. A hollow cylinder (open at both ends) has an external diameter of 14 cm, length of 14 cm and thickness of 1 cm. Find its total surface area (in cm2 upto two decimal places).   Hint       7. Find the total surface area (in cm2) of an metallic pipe (open at both ends) of external diameter 28 cm, internal diameter 7 cm and length 40 cm.   Hint