5. A section of water trough for a poultry farm is shown on the right. The triangular face is a right triangle with a base of 3 inches and height of 5 inches. The trough runs the length of the barn, which is 120 feet long. a) Determine the amount of sheet metal required to build the trough. b) Determine the volume of the trough in cubic inches. c) A cubic inch is about 0.004 33 gallons. About how many litres of water can the trough hold? 3 in. 5 in.​