6 A restaurant is building a new addition that has a rectangular seating area with a semi circular windowed alcove as shown below SHOW YOUR WORK 10 marks 14 ft 9 in 3 45 m 2 84 m 38 ft 4 in a Find the floor area of the shape in square feet b The ceiling height will be 12 feet Find the volume of the space in cubic feet c The design requires 11 air changes per hour Calculate the total CFM needed for the space d The designed air speed in the duct work is 275 ft min Calculate the cross sectional area of the duct work needed for this air speed e If a circular duct is used to supply this air specify the diameter of the duct to be used