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A platform and a building are on the same horizontal plane. The angle of depression...

A platform and a building are on the same horizontal plane. The angle of depression of the bottom C of the building from the top A of the platform is 39°. The angle of elevation of the top D of the building from the top of the platform is 56°. Given that the distance between the foot of the platform and that of the building is 10 m, what is the height of the building (to the nearest whole number)?
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Asked by BlackRobot on 28th April, 2020
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