Asked by chris
                a plat form and a building are on the same horizontal plane , the angle of depression of the bottom of the building from the top A of the platform is 39 degree. the angle of elevation of the top D of the building from the top of the platform is 56 degree. given that the distance between the foot of the platform and that of the building is 10m. calculate the height of the building, to the nearest whole number
            
            
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