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Hi Oliver. The average height of the room would be the height of a simple box with the same floor area. So you need to just find the volume of the house shaped as described, then divide by the floor area. If you need more help, write back and let us know where you are stuck. Cheers, Oliver wrote back
Oliver, I labeled two more points on the diagram and identified them with dots. What is the slope of the line SA? Can you use this slope to find the distance between B and P? Harley  


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