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Question - Heights and Distances - Angle of Elevation, Angle of Depression

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ConceptHeights and Distances - Angle of Elevation, Angle of Depression  

Question

If the angle of elevation of a cloud from a point h metres above a lake is α and the angle of depression of its reflection in the lake is β, prove that the height of the cloud is

`\frac{h(\tan\alpha +\tan \beta )}{\tan \beta -\tan \alpha }`

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