# Angle of Depression and Tangent

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A man on the roof of a building of known height meters is calling to his dog, sitting a distance of meters from the base of the building. The man measures the angle of depression of his line of sight from the horizontal. How far is the dog from the building in terms of and ?

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Contributed by: S. M. Blinder (July 2018)

Open content licensed under CC BY-NC-SA

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